Josh Chesler is a professor in the Department of Mathematics & Statistics at California State University, Long Beach. His research interests are in mathematics education, particularly in the preparation of mathematics teachers. He serves on the curriculum development team for the Mathematical Reasoning with Connections (MRWC) 12th grade mathematics course in California. Prior to completing a Ph.D. in Mathematics, he earned a B.A. in Anthropology, worked in the finance industry, and did some software development. Josh believes that an important power of mathematics is the joy it can bring when sense making and problem solving are emphasized.