Matthew Zavitz was a male teacher in the early 24th century, and a colleague of Sonek Pran. Pran introduced Zavitz to a friend, Rupi Yee, and the two dated for a short period. After Zavitz broke up with Yee, she and Pran began a romantic relationship, and were ultimately married. (STnovel: A Singular Destiny)
It is unclear when Zavitz's relationship with Yee took place, though it was likely in the 2330s or 2340s.