David Kelly (mathematics educator)

Kelly was originally from New Rochelle, New York, but moved frequently as the child of a military father.^[1] He held an AB from Princeton, an SM from MIT^[2] (after stopping out from a doctoral program there^[1]) and an AM from Dartmouth.^[2]

Kelly taught at Oberlin College and Talladega College^[2] before joining Hampshire College in 1970 as one of its founding faculty members.^[1] He founded the Hampshire College Summer Studies in Mathematics, a six-week program for mathematically talented high school students, in 1971 and directed the program for many years.

He retired in 2015,^[3] and died on June 10, 2025.^[1]

During his time at Princeton in the early 1960s, Kelly and fellow student Michael Spivak^[4] created "Yellow Pig's Day," an annual celebration of mathematics and the number 17. He continued to be involved in the organization of the holiday each year, commemorating the day with food, songs,^[5] a reunion, and mathematics.^[6] He was quite familiar with many of the properties of the number 17,^[6] and gave a special lecture on the subject each summer.