I obtained my PhD. (in Numerical Analysis) at the University of Iowa in 1990 under the direction of Kendall E. Atkinson. My current research interest is in mathematical  models for ecological problems: dynamics of predator-prey type models and ecological networks algorithms.


  • Interim chair/Professor, Department of Computer Science at The University of South Dakota. 2017-> present
  • Professor of Mathematics, Department of Mathematical Sciences at The University of South Dakota. 1989-> Present
  • Adjunct Professor, Mathematical, Computational & Modeling Sciences Center (MCMSC) at Arizona State University. 2009-> Present
  • Visiting research faculty, Summer Mathematical and Theoretical Biology Institute (MTBI) at the Center for Mathematical, Computational, and Modeling Sciences Center. Arizona State University.  2009-Present.
  •  MTBI is the recipient of the 2011 presidential award for excellence in sciences, mathematics, and engineering mentoring.
  •   External collaborator in the grants PUCV Nº 124.730/2012, Fondecyt Nº 1120218.  "Multistability and periodicity on predator-prey models due to ecological phenomena affecting some populations" Director of the grant: Eduardo González-Olivares 2012-2014.
  • International Collaborator at Rodrigo-Ramos research Lab at Biodiversirty Laboratories of the National Center for the Environment (CENMA). 2009-Present
  • Environmental pollution goes theoretical ecology OIKOS-Blog
  • Member of the Editorial board of BIOMAT Institute for Advance Studies in Biosystems.
  • Member of the Empowering Leadership Alliance
  • Member of the Math Alliance

Honors and Awards

  • 2011 Presidential award for excellence in sciences, mathematics, and engineering mentoring to MTBI.
  • 2008  Harrington Lecturer "Research in Mathematical Ecology and the Struggle for Existence"
  • 2008 Fulbright Scholar at the Institute of Mathematics of the Catholic University of Valparaiso, Valparaiso, Chile.
  • 2006 Richard & Sharon Cutler Faculty Award in Liberal Arts
  • 2004 Governor's Faculty Award for Teaching with Technology
  • 2002 Governor's Faculty Award for Teaching with Technology
  • 1998 Governor's Faculty Award for Teaching with Technology
  • 1997 NSF-ILI Project  
  • 1996 USD Professor of the year, Student Association.

Technology in the mathematics curriculum                                              

Multivariable calculus material:

  1. Animated version of Lagrange's Theorem (in Spanish). 
  2. My MERLOT page. 
  3. Calculus III.