First BASIC program, 1969

PhD in Mathematics, Univ. of Illinois, 1984

\(\TeX\)/\(\LaTeX\) user since mid-1980's

Roughly 15 research articles, 80's and 90's

Gopher site, approx. 1992

Open source linear algebra textbook, initiated 2004

Sage software developer, 2008–present

36 years teaching mathematics, strictly undergraduates

Know a little about each of many things