Clarissa Stein's uncle

An unnamed man is the uncle of Clarissa Stein and a professor at Ivy University.

Original timeline
At some point in his life, he became a professor at Ivy University. In October 1975, he brought his niece Clarissa to a faculty, where she met and fell in love Martin Stein, and the two would eventually marry.

Altered timeline
In October 1975, a future version of Martin Stein and his teammates Jefferson Jackson and Sara Lance knocked him unconscious in an attempt to steal something from him, and he never went to the mixer, thus, never meeting Clarissa and marrying her. This timeline would be erased when afterwards, Rip Hunter traveled back and convinced him to go to the mixer.

Season 1

 * Pilot, Part 2