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Hal Smith

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Professor
Faculty, TEMPE Campus, Mailcode 1804
Biography

Hal Smith's research focuses on differential equations, dynamical systems, and their applications to the biological sciences. Differential equations constitute the basic language of how things change with time or with space, or with both: Newton's second law of motion being the most well known example.

Those describing change in a biological system, for example, changes in the number of susceptible, infected and recovered individuals as an epidemic progresses, are often quite different than those that arise in the physical sciences.

His more theoretical work, the subject of two monographs, is directed towards developing new mathematical tools that facilitate understanding the long-term behavior of solutions of differential equations arising in biology. He also works on applying these methods to particular problems including modeling the microbial community of the mammalian gut, the in-vivo dynamics of the HIV virus infection of immune cells, and antibiotic treatment of bacterial infections.

 

Education

PhD, 1976, University of Iowa

Hal Smith's faculty webpage

Publications
  • J. Dockery, I. Klapper, H.S. Niche Partitioning along an environmental gradient. SIAM J. on Applied mathematics (2014).
  • M. Imran, H.S. A Model of Optimal Dosing of Antibiotic Treatment in Biofilm. Mathematical Bioscience and Engineering (2014).
  • D. Jones, H. Smith, H. Thieme. Spread of Viral Infection of Immobilized Bacteria. Networks and Heterogeneous Media (2013).
  • Hal Smith and H. Thieme. Chemostats and epidemics: competition for nutrients or host,. Mathematical Bioscience and Engineering (2013).
  • Hal Smith and H. Thieme. Persistence and global stability for a class of discrete time structured population models. Discrete and Continuous Dynamical Systems-A (2013).
  • Bhattacharyya J, Smith HL, Pal S. Allelopathy of plasmid-bearing and plasmid-free organisms competing for two complementary resources in a chemostat. Journal of Biological Dynamics (2012).
  • H. Thieme and Hal Smith. Persistence of Bacteria and Phages in a Chemostat. J. Mathematical Biology (2012).
  • Hal Smith. Global Dynamics of the smallest Chemical Reaction System with Hopf Bifurcation. Journal of Mathematical Chemistry (2012).
  • Hal Smith and Yun Kang. Global Dynamics of a Discrete Two-species Lottery-Ricker Competition Model. J. Biological Dynamics (2012).
  • Hal Smith, H. Thieme, D. Jones, G. Rost. On Spread of Phage Infection of Bacteria in a Petri Dish. SIAM J. Applied Mathematics (2012).
  • Zhun Han, H. Smith. Bacteriophage-Resistant and Bacteriophage-Sensitive Bacteria in a Chemostat. Math. Biosciences and Eng (2012).
  • D. Jones and Hal Smith. Bacteriophage and Bacteria in a Flow Reactor. Bulletin Math. Biol (2011).
  • H. Smith, H. Thieme. A Reaction-Diffusion System with Time-Delay Modeling Virus Plaque Formation. Canadian Applied Math. Quarterly (2011).
  • Hal Smith. Bacterial Competition in Serial Transfer Culture. Mathematical Biosciences (2011).
  • Hal Smith. Well-Posedness and Dissipativity for a Model of Bacteriophage and Bacteria in a Flow Reactor. Rocky Mountain J. of Math (2011).
  • Hal Smith, H. Thieme. Dynamical Systems and Population Persistence. (2011).
  • Hal Smith. Some Persistence Results for Systems of Difference Equations. Proceedings of the International Workshop, Future Directions in Difference Equations. June 13-17, 2011, Vigo, Spain. "Servizo de Publicacións da Universidade de Vigo", Colección Congresos, 69, 2011, (Editors: Eduardo Liz and Víctor Mañosa), ISBN: 978-84-8158-541-4 (2011).
  • Hal Smith. An Introduction to Delay Differential Equations with Applications to the Life Sciences,, Springer, 2010. (2010).
  • H.L. Smith. Tribute to Horst Thieme on the occasion of his 60th Birthday. Mathematical Biosciences and Engineering (2010).
  • P. Salceanu and H.L. Smith. Lyapunov exponents and persistence in some discrete dynamical systems. Discrete and Continuous Dynamical Systems-B (2009).
  • P. Salceanu and H.L. Smith. Persistence in a Discrete-time Stage-Structured Fungal Disease Model. J. Biological Dynamics (2009).
  • R. Trevino and H.L. Smith. Bacteriophage Infection Dynamics: Multiple Host Binding Sites. Math.Model. Nat. Phenom (2009).
  • H.L. Smith and P. Salceanu. Lyapunov Exponents and Uniform Weak Normally Repelling Invariant Sets. Springer, Lecture Notes in Control and Information Sciences 389, R. Bru and S. Romero-Vivo eds., Springer, Berlin (2009).
  • G Enciso, M Hirsch, Hal Smith. Prevalent behavior of strongly order preserving semiflows. J.Dynamics and Diff. Eqns (2008).
  • Hal Smith. Global stability for Mixed Monotone Systems. J. Difference Equations and Appl (2008).
  • Hal Smith. Models of Virulent Phage Growth with application to Phage Therapy. SIAM J. Appl. Math (2008).
  • Hal Smith, Tufail Malik. Does Dormancy increase Fitness of Bacterial Populations in. Bulletin of Mathematical Biology (2008).
  • M. Ballyk, D. Jones, H. Smith. The Biofilm Model of Freter: a review. Structured Population Models in Biology and Epidemiology (2008).
  • B Li, Hal Smith. Global dynamics of microbial competition for two resources with internal storage. J. Mathematical Biology (2007).
  • H Wang, Y Kuang, J Elser, Hal Smith. Dynamics of Stoichiometric Bacteria-Algae Interaction in Epilimnion. SIAM J. Applied Math (2007).
  • M. Imran, H. Smith. A Mathematical Model of Gene Transfer in a Biofilm. Mathematics for Ecology and Environmental Sciences, series: Biological and Medical Physics, Biomedical Engineering (2007).
  • B Li, S Baer, Hal Smith. Multiple limit cycles in the standard model of three species competition for three essential resources. J. Mathematical Biology (2006).
  • E Sontag, G Enciso, Hal Smith. Non-monotone systems decomposable into monotone systems with negative feedback. J. Differential Equations (2006).
  • Hal Smith. The discrete dynamics of monotonically decomposable maps. J. mathematical Biology (2006).
  • M Hirsch, Hal Smith. Asymptotically Stable Equilibria for Monotone Semiflows. Discrete and Continuous Dynamical Systems (2006).
  • M Imran, Hal Smith. The pharmacodynamics of antibiotic treatment. Journal of Computational and Mathematical Methods in Medicine (2006).
  • T Malik, Hal Smith. A resource-based model of microbial quiescence. J. Mathematical Biology (2006).
  • M Hirsch, Hal Smith. Monotone Maps: a review. J. Difference Equations& Applications (2005).
  • Mudassar Imran, Don Jones, Hal Smith. Biofilms and the Plasmid Maintenance question. Mathematical Biosciences (2005).
  • Hirsch, M W (Author) ,Smith, Hal L (Author) . Chapter 4: Monotone dynamical systems. Handbook of Differential Equations , Ordinary Differential Equations ( volume 2) (2005).
  • M Hirsch, Hal Smith. Generic Quasi-convergence for strongly order preserving semiflows: a new approach. J. Dynamics and Diff. Eqns (2004).
  • X Zhao, Hal Smith. Traveling Waves in a Bio-reactor Model. Nonlinear Analysis: Real World Applications (2004).
  • . . Review of: Differential Equations and Mathematical Biology (2004).
  • . . Review of: Spatial Ecology via Reaction-Diffusion Equations (2004).
  • Hal Smith, B Li. Periodic Coexistence of 4 species competing for 3 essential resources. Math. Biosciences (2003).
  • Hal Smith, Don Jones, Hristo Kojouharov, Dung Le. Bacterial wall attachment in a flow reactor: mixed culture. Canadian Applied Math. Quarterly (2003).
  • Hal Smith, Don Jones, Hristo Kojouharov, Dung Le. The Freter model: a simple model of biofilm formation. J. Math. Biology (2003).
  • Hal Smith, Le Kojouharov. Microbial competition for nutrient in a 3D flow reactor. Dynamics of Continuous, Discrete and Impulsive Dynamical Systems (2003).
  • Hal Smith, M Hirsch, Alberto De Santis, Lorenzo Farina. Monotone systems, a mini-review in Positive Systems. Proceedings of the First Multidisciplinary Symposium on Positive Systems (2003).
  • Hal Smith, P de Leenheer, B Li. Competition in the Chemostat: some remarks. Canadian Quarterly of Applied Math (2003).
  • Hal Smith, Patrick de Leenheer. Feedback Control for chemostat models. J. Math. Biol (2003).
  • Hal Smith, Patrick Leenheer. Virus Dynamics: a global analysis. SIAM J. Appl. Math (2003).
  • Smith, Hal L,Li, B. Competition for Essential Resources: a brief review. Dynamical Systems and Their Applications in Biology (2003).
  • Hal Smith, Don Jones, Hristo Kojouharov. Bacterial wall attachment in a Flow reactor. SIAM J. Appl. Math (2002).
  • Hal Smith, Le Dung. Strong positivity property of solutions to parabolic and elliptic equations on nonsmooth domains. J. Math. Anal.& Applications (2002).
  • H Thieme, Hal Smith. Stable coexistence and Bi-stability for competitive systems on ordered Banach spaces. J. Diff. Eqns (2001).
  • Hal Smith, M Ballyk, D Jones. Microbial competition in reactors with wall attachment: a comparison of chemostat and plug flow models. Microbial Ecology (2001).
  • Hal Smith, X Zhao. Competitive exclusion in a discrete-time size-structured chemostat model. Discrete and Contin. Dynamical Systems (2001).
  • Hal Smith, X Zhao. Robust Persistence for semi-dynamical systems. Nonlinear Analysis (2001).
  • M Li, L Wang, Hal Smith. Global dynamics of a SEIR model with vertical transmission. SIAM J. Appl. Math (2001).
  • X Zhao, M Hirsch, Hal Smith. Chain transitivity, attractivity and strong repellors for semidynamical systems. J.Dynamics and Diff. Eqns (2001).
  • E Stemmons, Hal Smith. Competition in a chemostat with wall attachment. SIAM J. Appl.Math (2000).
  • Hal Smith, D Jones. Microbial competition for nutrient and wall sites in plug flow. SIAM J. Applied Math (2000).
  • Hal Smith, X Zhao. Microbial growth in a plug flow reactor with wall attachment and cell motility. JMAA (2000).
  • M Cavani, M Lizana, Hal Smith. Stable periodic orbits for a predator-prey model with delay. JMAA (2000).
  • P Waltman, Hal Smith. Competition in the Periodic Gradostat. Nonlinear Analysis: Real World Applications (2000).
  • X Zhao, Hal Smith. Global Asymptotic Stability of Traveling Waves in Delayed Reaction-Diffusion Equations. SIAM J. Math. Anal (2000).
  • . . Review of: Compartmental Modeling with networks (2000).
  • Smith, Hal. A semilinear hyperbolic system. World Scientifc (2000).
Research Activity
Fall 2017
Course NumberCourse Title
MAT 275Modern Differential Equations
MAT 495Undergraduate Research
STP 590Reading and Conference
MTE 590Reading and Conference
MAT 590Reading and Conference
MAT 591Seminar
MAT 592Research
STP 599Thesis
MAT 599Thesis
MTE 792Research
MAT 792Research
APM 792Research
MAT 795Continuing Registration
APM 799Dissertation
STP 799Dissertation
MTE 799Dissertation
MAT 799Dissertation
Summer 2017
Course NumberCourse Title
MAT 495Undergraduate Research
MAT 590Reading and Conference
MAT 599Thesis
MTE 792Research
MAT 792Research
APM 792Research
MTE 795Continuing Registration
Spring 2017
Course NumberCourse Title
MAT 495Undergraduate Research
APM 502Differential Equations II
MAT 590Reading and Conference
MAT 592Research
MTE 792Research
STP 792Research
MAT 792Research
APM 792Research
MTE 799Dissertation
MAT 799Dissertation
APM 799Dissertation
Fall 2016
Course NumberCourse Title
MAT 495Undergraduate Research
MAT 590Reading and Conference
STP 590Reading and Conference
MTE 590Reading and Conference
MAT 591Seminar
MAT 592Research
MAT 598Special Topics
STP 599Thesis
MAT 599Thesis
MTE 792Research
MAT 792Research
APM 792Research
MAT 795Continuing Registration
APM 799Dissertation
STP 799Dissertation
MTE 799Dissertation
MAT 799Dissertation
Summer 2016
Course NumberCourse Title
MAT 495Undergraduate Research
MAT 590Reading and Conference
MAT 592Research
MAT 599Thesis
MTE 792Research
APM 792Research
MAT 792Research
MTE 795Continuing Registration
MAT 799Dissertation
Spring 2016
Course NumberCourse Title
MAT 495Undergraduate Research
APM 502Differential Equations II
MAT 590Reading and Conference
MAT 599Thesis
STP 792Research
MTE 792Research
MAT 792Research
APM 792Research
APM 799Dissertation
Fall 2015
Course NumberCourse Title
MAT 495Undergraduate Research
APM 503Applied Analysis
MAT 590Reading and Conference
MAT 591Seminar
MAT 592Research
MAT 599Thesis
APM 790Reading and Conference
MTE 792Research
MAT 792Research
APM 792Research
MTE 799Dissertation
MAT 799Dissertation
APM 799Dissertation
Summer 2015
Course NumberCourse Title
MAT 792Research
APM 792Research
Spring 2015
Course NumberCourse Title
MAT 275Modern Differential Equations
MAT 476Partial Differential Equations
MAT 792Research
APM 792Research
Fall 2014
Course NumberCourse Title
MAT 792Research
APM 792Research
Summer 2014
Course NumberCourse Title
APM 792Research
MAT 799Dissertation
Spring 2014
Course NumberCourse Title
APM 598Special Topics
MAT 792Research
APM 792Research
Fall 2013
Course NumberCourse Title
MAT 342Linear Algebra
MAT 452Intro Chaos/Nonlinear Dynamics
MAT 792Research
APM 792Research
Summer 2013
Course NumberCourse Title
APM 792Research
MAT 799Dissertation
Spring 2013
Course NumberCourse Title
MAT 342Linear Algebra
MAT 792Research
APM 792Research
Fall 2012
Course NumberCourse Title
MAT 275Modern Differential Equations
APM 576Theory Partial Diff Equations
APM 792Research
MAT 799Dissertation
Presentations
  • Hal Smith. Spread of viral plaque. session on Virus Dynamics, Immunology, and Transmission, 2013 SIAM Conference on Dynamical Systems (May 2013).
  • Hal Smith. Mathematical Modeling of Bacteria and Bacteriophage Interactions in a Chemostat and in a Petri Dish. Colloquium, University of Louisville (Apr 2013).
  • Hal Smith. The Hale-Waltman Persistence Theorem with applications to plant population dynamics. First International Conf. on Dynamics of Differential Equations (Mar 2013).
  • Hal Smith. Spread of Viral Plaque. EVERYTHING DISPERSES TO MIAMI: THE ROLE OF MOVEMENT AND DISPERSAL IN SPATIAL ECOLOGY (Dec 2012).
  • Hal Smith. Spread of viral plaque. International Conference on the Theory, Methods and Applications of Nonlinear Equations (Dec 2012).
  • Hal Smith. Spread of Viral Plaque,. Montana State University (Oct 2012).
  • Hal Smith. Dynamics of Bacterial Competition in Serial Transfer,. Math Biology Seminar, ASU (Sep 2012).
  • Hal Smith. Modeling Microbial Populations in the Chemostat,. MTBI Summer Program (Jul 2012).
  • Hal Smith. Lectures on Monotone Systems. Silesian Mathematical Summer School in Opava (Jun 2012).
  • Hal Smith. Spread of Viral Plaque. Bolyai Institute, University of Szeged (Jun 2012).
  • Hal Smith. Modeling Microbial Populations in the Chemostat,. Undergraduate Summer Research Two-week Program, MBI, Ohio State Univ., May 30, 2012 (May 2012).
  • Hal Smith. Spread of Viral Plaque,. Analysis, Dynamics, and Applications Seminar, Univ. Arizona (Mar 2012).
  • H.L. Smith. Modeling Bacteriophage and Bacteria, invited seminar talk,, Cornell University, Oct. 31, 2011. Ecology and Evolutionary Biology, Cornell Univ (Oct 2011).
  • H.L. Smith. Modeling Bacteriophage and Bacteria, plenary lecture, Inzell, Germany,. Summer School on Nonautonomous and Random Dynamical Systems in Life Sciences, (Aug 2011).
  • H.L.Smith. Spread of Viral Plaque, plenary lecture, Inzell, Germany,. Summer School on Nonautonomous and Random Dynamical Systems in Life Sciences, (Aug 2011).
  • H.L. Smith. Spread of Viral Plaques, plenary talk,. Emerging Challenges at the Interface of Mathematics, Environmental Science and Spatial Ecology'', BI (Jul 2011).
  • H.L. Smith. Spread of Viral Plaque, , July 18,2011. ICIAM 2011 session on ``Microbial Ecology" (Jul 2011).
  • H.L. Smith. Persistence of Bacteria and Phages in a Chemostat,, July 21, 2011. ICIAM 2011 session on ``Modeling of Ecological Systems" (Jul 2011).
  • H.L. Smith. Modeling Bacteriophage and Bacteria,, ASU, July 29, 2011. MTBI summer program (Jul 2011).
  • H.L. Smith. Persistence for Discrete-Time, Non-Linear, Matrix Population Models, plenary talk,. Future Directions in Difference Equations (Jun 2011).
  • H.L.Smith. Monotone Dynamical Systems: a quick tour. DIMACS Workshop on Perspectives and Future Directions in Systems and Control Theory (May 2011).
  • Hal Smith. Dynamics of Bacterial Competition in Serial Transfer. special session on Continuous \& Discrete Dynamical Systems, AMS regional meeting, UCLA (Oct 2010).
  • Hal Smith. Bacteriophage and Bacteria in Chemostat and Flow Reactor. Math Biology Seminar, ASU (Sep 2010).
  • Hal Smith. Bacteriophage and Bacteria in Chemostat and Flow Reactor. Applied Sciences Colloquium, ASU Polytechnic (Aug 2010).
  • Hal Smith. Bacteriophage and Bacteria in Chemostat and Flow Reactor. session on ``Bacterial Biofilms: Models, Analysis, and Simulation'', SIAM Conf. on Life Sciences (Jul 2010).
  • hal Smith. The Freter Model of Biofilm Formation. Biofilms in Infectious Disease: Biology to Mathematical Models and Back Again (Mar 2010).
  • H.L.Smith. Lyapunov Exponents and Persistence. The Second International Conference on Mathematical Modeling and Analysis of Populations in Biologi (Oct 2009).
  • P.Salceanu and H.L.Smith. Lyapunov exponents and uniformly weak normally repelling invariant sets. International Symposium on Positive Systems: Theory and Applications (Sep 2009).
  • H.L.Smith. Competition for Essential Resources and Diversity. Ecological Society of Amer. annual meeting, (Aug 2009).
  • H.L. Smith. Bacteriophage Infection Dynamics: Multiple Host Binding Sites. NESCent Mathematical Models, Microbes \& Evolutionary Diversification Meeting - July 17-18, 2009 (Jul 2009).
  • Hal Smith. Remarks on the Theory of Persistence. Conf. on Differential Equations and Applications in Ecology and Epidemiology (Dec 2008).
  • H. Smith. Persistence in Semidynamical Systems. Internat. Conf. on Difference Eqns. and Applications, Bahcesehir University, Istanbul, Turkey (Jul 2008).
  • Enciso, M. Hirsch, H. Smith. Prevalent behavior of strongly order-preserving semiflows,. Workshop on Mathematical tools for multi-scale biological processes, Montana State Univ (Jun 2008).
  • Enciso, M.W.Hirsch, H.L. Smith. Prevalent behavior of strongly order-preserving semiflows. Amer. Math. Soc. regional meeting, Claremont McKenna College (May 2008).
  • Hal Smith. Models of Virulent Phage Growth with application to Phage Therapy. Colloquium, Pomona College (Apr 2008).
  • Hal Smith. Models of Virulent Phage Growth with application to Phage Therapy. Conference on ``Dynamics of structured populations", Banff International Research Station (Apr 2008).
  • Hal Smith. Models of Virulent Phage Growth with application to Phage Therapy. Colloquium , Georgia Tech School of Math (Feb 2008).
  • Smith, Hal. The Dynamics of Bacterial Infection, Innate Immune Response, and Antibiotic Treatment. Math Biology Seminar (Dec 2006).
  • Smith, Hal. Dynamical Systems in Biology. 3rd Symp., Frontiers of Statistical, Mathematical, and Computational Sciences (Oct 2006).
  • Smith, Hal. The Dynamics of Bacterial Infection, Innate Immune Response, and Antibiotic Treatment. Colloquium, Applied Mathematics (Oct 2006).
  • Smith, Hal, Imran, M. Biofilms and the plasmid maintenance question. Joint SIAM-SMB Conference on the Life Sciences, session on Continuum Modelling of Bacterial Biofilm (Aug 2006).
  • Smith, Hal. An overview of monotone dynamical systems. Colloquium, Math Biology Institute (Feb 2006).
  • Smith, Hal. High dimensional dynamics of continuous and discrete systems reduced to low dimensional dynamics of mappings. MathFest Program, annual MAA meeting, Albuquerque (Aug 2005).
  • Smith, Hal. Mixed monotone difference equations. International Conference on Difference Equations, Special Functions \& Applications (Jul 2005).
  • Enciso, G, Sontag, E, Smith, Hal. Monotonicity in biological systems: positive and negative feedback. European Conference on Mathematical and Theoretical Biology (Jul 2005).
  • Enciso, G, Sontag, E, Smith, Hal. Monotonicity in biological systems: positive and negative feedback. International workshop on Differential Equations in Mathematical Biology (Jul 2005).
  • Hirsch, M, Smith, Hal. Asymptotically stable equilibria for monotone semiflows. Mississippi State-UAB Conference on Differential Equations (May 2005).
  • Smith, Hal. Monotone Maps: a review. 9th International Conference on Difference Equations and Applications (Aug 2004).
  • Smith, Hal. Gene Transfer in Biofilms: math models and implications. II Seminario de Biomatematica (Aug 2004).
  • Smith, Hal. Gene Transfer in Biofilms: math models and implications. Int. Conf. for Mathematics in Biology and Medicine (Jul 2004).
  • Smith, Hal. Gene Transfer in Biofilms: math models and implications. Canada-France Meeting of Mathematics (Jul 2004).
  • Smith, Hal. Monotone Maps: a review. Int. Conf. on Nonlinear Dynamics and Evolution Equations (Jul 2004).
  • Smith, Hal. Gene Transfer in Biofilms: math models and implications. International Symposium on Dynamical Systems Theory and its Applications to Biology and Environmenta (Mar 2004).
  • Smith, Hal. Competition for essential resources. 5-th Americas Conference on differential equations and dynamical systems (Jul 2002).
  • Smith, Hal. Virus Dynamics: a global analysis. Special Session on Mathematical Biology,regional meeting of AMS (Jun 2002).
  • Smith, Hal. Colonization resistence in the gut and microbial surface colonization of bio-reactors: an exploration of the Freter Model. 22nd meeting of Canadian Applied & Industrial Mathematics Soc (Jun 2001).
  • Smith, Hal. Gene Transfer in Biofilms: a mathematical model. Arizona Days 2004
Service
  • School of Math & Stats, mentor to new faculty member Jason (M.-H.) Kao (2009 - Present)
  • Probability Hiring Committee, chair (2008 - Present)
  • NSF, Reviewer (2008 - Present)
  • Personnel & Budget, chair (2008 - Present)
  • Personnel & Budget, chair (2008 - Present)
  • Promotion & Tenure Letters, External Evaluator (2008 - Present)
  • Journal of Biological Dynamics, Associate Editor (2006 - Present)
  • Natural Research and Engineering Research Council of Canada, Grant Reviewer (2005 - Present)
  • Mathematical Biosciences and Engineering, Advisory Editor (2005 - Present)
  • Referee, Referee/Math Review (2005 - Present)
  • Chair Search, member (2004 - Present)
  • Siam J. Applied Mathematics, Section Editor for Biology papers (2003 - Present)
  • Discrete and Continuous Dynamical Systems-series B, Associate Editor (2002 - Present)
  • Differential Equations and Dynamical Systems, Associate Editor (2000 - Present)
  • J. of Difference Equations and Application, Associate Editor (2000 - Present)
  • Electronic Journal of Differential Equations, Associate Editor (1998 - Present)
  • Mathematical Biosciences Institute Scientific Advisory Committee, member (2014 - 2017)
  • NCTS International Conference on Nonlinear Dynamics with Applications to Biology, Conference organizer (2014 - 2014)
  • NSERC, reviewer (2014 - 2014)
  • referring activities, referee for journal (2014 - 2014)
  • Mathematical Biosciences and Engineering, Advisory Editor (2005 - 2014)
  • J. of Difference Equations and Application, Associate Editor (2000 - 2014)
  • Electronic Journal of Differential Equations, Associate Editor (1998 - 2014)
  • Scientific Committee for ICDEA 2014 in Wuhan, China, select plenary speakers (2013 - 2014)
  • Society for Mathematical Biology, Annual Meeting, Osaka Japan, Scientific committee member (2013 - 2014)
  • NCTS International Conference on Nonlinear Dynamics with Applications to Biology, conference co-organizer-suggest speakers (2013 - 2014)
  • Awards Committee, chair (2014 - 2014)
  • Siam J. Applied Mathematics, Section Editor for Life Sciences (2003 - 2014)
  • Promotion and tenure letters, external evaluator (2013 - 2013)
  • Refereeing activities, Referee (2013 - 2013)
  • Mathematical Biosciences and Engineering, Advisory Editor (2005 - 2013)
  • J. of Difference Equations and Application, Associate Editor (2000 - 2013)
  • Electronic Journal of Differential Equations, Associate Editor (1998 - 2013)
  • Society for Mathematical Biology, main organizer for annual meeting held at ASU June 9-13, 2013 (2012 - 2013)
  • Society for Mathematical Biology, main organizer for annual meeting to be held at ASU June 2013 (2012 - 2013)
  • Society for Mathematical Biology, chair: organizing committee for 2013 annual meeting (2011 - 2013)
  • Visiting Assistant Professor Hiring Committee, chair (2012 - 2013)
  • Siam J. Applied Mathematics, Section Editor for Biology papers (2003 - 2013)
  • Siam J. Applied Mathematics, Section Editor for Life Sciences (2003 - 2013)
  • I was asked to co-organize a special session at conference "Everything Disperses to Miami"., Organizer of special session (2012 - 2012)
  • JOURNAL REFEREE:, referee (2012 - 2012)
  • Promotion and Tenure, evaluator (2012 - 2012)
  • International Society for Difference Equations, Aulbach Prize Committee (2012 - 2012)
  • Lanchier P&T committee, member with armbruster and speilberg (2012 - 2012)
  • French National Research Agency, referee (2012 - 2012)
  • NSF, reviewer (2012 - 2012)
  • Personnel & Budget Committee, member (2011 - 2011)
  • Journal referee, referee for journal articles (2011 - 2011)
  • Promotion & Tenure Letters, evaluation of applicant for promotion/tenure (2011 - 2011)
  • Review of Grant Applications, reviewer of Grant Applications (2011 - 2011)
  • Mathematical Biosciences and Engineering, Advisory Editor (2005 - 2011)
  • J. of Difference Equations and Application, Associate Editor (2000 - 2011)
  • Electronic Journal of Differential Equations, Associate Editor (1998 - 2011)
  • International Conference on Industrial and Applied Mathematics, 2011, co-organizer of special session: Microbial Ecology (2010 - 2011)
  • Journal of Difference Equatiions & Applications, chair: 2010 Best Paper Award Committee (2011 - 2011)
  • NSF, Mathematical Biology Panel April 18-19, 2011 (2011 - 2011)
  • Siam J. Applied Mathematics, Section Editor for Biology papers (2003 - 2011)
  • NSERC, external reviewer for 2 proposals (2010 - 2010)
  • Promotion & Tenure committee S,-C.-Chen, member (2010 - 2010)
  • International Society of Difference Equations, member, Aulbach Prize Committee (2010 - 2010)
  • P&T letters, promotion & tenure (2010 - 2010)
  • International Society of Difference Equations (ISDEA 2010), scientific committee (2009 - 2010)
  • Journal of Biological Dynamics, Associate Editor (2006 - 2010)
  • Mathematical Biosciences and Engineering, Advisory Editor (2005 - 2010)
  • Discrete and Continuous Dynamical Systems-series B, Associate Editor (2002 - 2010)
  • J. of Difference Equations and Application, Associate Editor (2000 - 2010)
  • Electronic Journal of Differential Equations, Associate Editor (1998 - 2010)
  • International Society of Difference Equations (ISDEA 2010), scientific committee (2009 - 2010)
  • Journal of Difference Equatiions & Applications, chair: 2009 Best Paper Award Committee (2010 - 2010)
  • Personnel & Budget, chair (2008 - 2010)
  • faculty search committee, chair (2009 - 2010)
  • General Search Hiring Committee, chair (2009 - 2010)
  • referee, Referee Journal articles (2009 - 2009)
  • Promotion & Tenure Letters, External Evaluator (2008 - 2009)
  • Journal of Difference Equatiions & Applications, chair: 2008 Best Paper Award Committee (2009 - 2009)
  • AMS Western section program committee, chair (2007 - 2007)
  • Probability hiring committee, appointed member (2006 - 2007)
  • Graduate Reorganizing, member (2006 - 2007)
  • Joint SIAM-SMB Conference on the Life Sciences, Co-organizer, special session on Population Models with explicit resource dynamics (2006 - 2007)
  • session Math. Modeling in Biol. & Medicine, organizer (2007 - 2007)
  • Chair Search Committee, elected member (2006 - 2006)
  • J. of Difference Equations and Applications, Co-Guest editor Volume 11, No 4-5, April 2005 (2005 - 2006)
  • Nonlinear Analysis: Real World Applications, Associate Editor (2003 - 2006)
  • Rocky Mountain Journal of Mathematics, Associate Editor (2002 - 2006)
  • Taiwanese J. of Mathematics, Associate Editor (2000 - 2006)
  • Math Bio Hiring Committee, member (2005 - 2006)
  • Personnel & Budget Committee, member (2005 - 2006)
  • Personnel & Budget, member (2005 - 2005)
  • Rutgers University, Mathematics Dept, External evaluator of Phd thesis (2005 - 2005)
  • Turku University, Dept. Mathematics, Finland, Opponent for Phd defence (2005 - 2005)
  • 2005 Intel International Science and Engineering Fair, Grand Awards Judge for Microbiology (2005 - 2005)
  • NSF, Panel Review for Mathematical Biology (2005 - 2005)
  • Canadian Applied Mathematics Quarterly, Associate Editor (2000 - 2005)
  • J. of Mathematical Analysis and Applications, Assoc. Editor (1995 - 2005)
  • Theoretical Biology Executive Committee, member (2005 - 2005)
  • Chair Search Committee, member (2004 - 2005)
  • Personnel & Budget, chair (2004 - 2005)
  • Awards, chair (2003)
  • CLAS senate, senator (2003)
  • Faculty Senate, dept. senator (2003)
  • Newsletter, member (2003)
  • Review, member (2003)