David Austin (PreTeXt edition) is a professor in the Department of Mathematics at Grand Valley State University. He is the author of the open textbook Understanding Linear Algebra, serves as the Director of the Open Textbook Initiative, sponsored by the American Institute of Mathematics, and is the lead developer of PreFigure, open-source software for creating accessible mathematical diagrams.
Matthias Beck is a professor in the Mathematics Department at San Francisco State University. His research interests are in geometric combinatorics and analytic number theory. He is the author of three other books, Computing the Continuous Discretely: Integer-point Enumeration in Polyhedra (with Sinai Robins, Springer 2007 & 2015), The Art of Proof: Basic Training for Deeper Mathematics (with Ross Geoghegan, Springer 2010), and Combinatorial Reciprocity Theorems: An Invitation to Enumerative Geometric Combinatorics (with Raman Sanyal, AMS 2018).
Dennis Pixton is a professor emeritus in the Department of Mathematical Sciences at Binghamton University (SUNY). His research interests are in dynamical systems and formal languages.
Lucas Sabalka is an applied mathematician at a technology company in Lincoln, Nebraska. He works on 3-dimensional computer vision applications. He was formerly a professor of mathematics at St. Louis University, after postdoctoral positions at UC Davis and Binghamton University (SUNY). His mathematical research interests are in geometric group theory, low dimensional topology, and computational algebra.
Chrissy Safranski (PreTeXt edition) is a Professor of Mathematics at the Franciscan University of Steubenville. She is on the editorial board of the Open Textbook Initiative, sponsored by the American Institute of Mathematics. She has taught with and contributed to several open-source PreTeXt-authored textbooks.
