Jeff drawn by Kate
portrait by Kate Erickson (2018)

I'm a computational geometer/topologist with more general interests in algorithms, data structures, and lower bounds. I'm the oldest member of the CS department's theory group. I teach mostly large algorithms classes; you might find my lecture notes useful. From 2013 to 2016, I was an associate department head and chair of the faculty recruiting committee. I have the lowest undergraduate GPA (2.4/4.0) of any professor I've ever met, although some of my colleagues came close, and a few others never finished college at all. (I really shouldn't be proud of that.) I like pancakes.

Praxis tendatum docebit. [Practice will teach those who try.]
— Carl Friedrich Gauß, describing the fast Fourier transform (c. 1805)

Man muß jederzeit an Stelle von „Punkte, Geraden, Ebenen“ „Tische, Stühle, Bierseidel“ sagen können. [One must always be able to say “tables, chairs, beer mugs” in place of “points, lines, planes”.]
— David Hilbert to Otto Blumenthal, on the axiomatic method in mathematics

I believe in the third dimension, but not the other two.
James "Kibo" Parry

As we all know, the easiest way to be at the top of your field is to choose a very small field.
Simone Giertz, "Why you should make useless things" (2018)