I am a professor of mathematics and public health at the University of Arizona. This site describes my work as a member of an international community of researchers and educators. The menus at the tocontain information about me and my professional activities. Some of the blog items below tell professional stories; others summarize information I have collected on important academic issues, or point to interesting work that I have seen in the recent literature. Collectively, the pages in this site illustrate my passion for curiosity-driven research, for elegant applications, and for discovering and sharing knowledge.