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.


  • Chair, Department of Computer Science at University of South Dakota. 2017-> present
  • International Collaborator Rodrigo-Ramos research Lab at Center for Genomics, Ecology & Environment (GEMA). Universidad Mayor, Santiago, Chile. 2018-Present.
  • 2018 Editorial Board Member (Associate editor) Mathematical Biosciences and Engineering (MBE
  • 2018 Editorial Board member of Mathematics (MDPI)
  • 2018 Editorial Board member of Mathematics Theoretical and Mathematical Ecology Section (MTME)
  • Professor of Mathematics, Department of Mathematical Sciences at The University of South Dakota. 1989-> Present
  • Adjunct Professor, Mathematical, Computational & Modeling Sciences Center (SAL-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-ASU
  • International Collaborator at Rodrigo-Ramos research Lab at Biodiversirty Laboratories of the National Center for the Environment (CENMA). 2009-2018.
  • 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

  • 2012-2014 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.
  • 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.