Officers of BIO SIGMAA

Current Officers

Meet our current officers and learn more about them by hovering over their picture.

Alex Capaldi

Valparaiso University 

Alex received his B.S./B.A. in mathematics and chemistry from Ferris State University and his Master of Operations Research and Ph.D in Applied Mathematics from North Carolina State University.  His research interests focus on theoretical ecology and evolution, particularly dealing with conservation, extinction, and historical biology.

Hannah Highlander

Hannah Highlander

Past Chair
University of Portland

Hannah earned a B.A. in Mathematics with minors in Computer Science and Music from Wesleyan College, and M.S. and Ph.D. in Mathematics with an emphasis in Mathematical Biology from Vanderbilt University. She is on the editorial board for Spora, A Journal of Biomathematics and Letters in Biomathematics and serves on the board of directors for the Intercollegiate Biomathematics Alliance (IBA).  Her primary research interests include mathematical modeling of biological processes, sensitivity analysis, mathematical biology education.



Anne Yust

University of Pittsburgh   


Anne received a BS in Mathematics from Bridgewater College in Virginia and a PhD in Mathematical Sciences from Carnegie Mellon University. She is currently a lecturer in the Mathematics Department at the University of Pittsburgh. In the 10+ years Anne has dedicated to undergraduate education, she has worked with numerous undergraduates on biomathematics research projects -- often incorporating virtual collaboration between students and faculty from institutions in different parts of the US. Recently, Anne has focused on involving first-year students in research in and outside of the classroom with agent-based modeling. She has also dedicated time to integrating mathematical and computational modules into biology courses and biological modules into mathematics and statistics courses. 


Frank Lynch

Frank Lynch

Eastern Washington University

Frank received his B.A. in mathematics and physics from Linfield College and his Ph.D from the University of Utah. His research interests include mathematical modeling of biological processes. He is particularly interested in biological gels, biochemical physiology, perturbation theory, and asymptotic analysis.


Timothy D. Comar

Program Chair and Electronic Communications
Benedictine University

Tim graduated with a Sc.B with Honors in Mathematics from Brown University and his Ph.D in Mathematics from the University of Michigan.He is committed to introducing and training undergraduate students in the biological sciences with appropriate and relevant mathematical and computuational skills so that they can succeed in future endeavors in modern, quantitative biological research. His research interests include hyperbolic manifolds, Kleinian groups, and topology.

Past Officers

  • Carl Cowen, Charter Chair, 2006
  • Eric Marland, Chair, 2007
  • Jonathan Rubin, Secretary, 2007
  • Laurie Heyer, Chair, 2008
  • Colm Mulcahy, Web Manager, 2006-2008
  • Glenn Ledder, Program Chair, 2007-2009
  • Raina Robeva, Chair, 2009, 2017-2019
  • Renee Salinas, Program Chair, 2009
  • Brian Walton, Secretary, 2010
  • Holly Gaff, Chair, 2010
  • Tim Comar, Chair, 2012, Program Chair, 2018-2020
  • David Gammack, Secretary, 2013 - 2014
  • Elsa Schaefer, Secretary, 2011 - 2013, Electronic Communications Director 2012 - 2014
  • Lester Caudill, Chair, 2014 - 2015
  • Borbala K. Mazzag, Program Chair, 2020-2022
  • Robert Stolz, Secretary, 2020-2022