September 10, 2019
12:00PM ET

April 28, 2020
12:00PM ET

- Rachel Levy (North Carolina State University)
January 24, 2023
12:00PM ET

- Tim Chartier (Davidson College & The Museum of Mathematics)
September 12, 2023
12:00PM ET

- Judy Holdener (Kenyon College)
November 21, 2023
12:00PM ET

- Paul Hand (Northeastern University )
December 3, 2024
12:00PM ET

- John Geddes (Olin College)
- Sarah Spencer Adams (Olin College)