Good on you for finding that. He stepped down at the same time.
Sergey Mikhailovich Brin[a] (Russian: Сергей Михайлович Брин; born August 21, 1973) is an American computer scientist and businessman who co-founded Google with Larry Page. He was the president of Google’s parent company, Alphabet Inc., until stepping down from the role on December 3, 2019.[1] He and Page remain at Alphabet as co-founders, controlling shareholders, and board members. Brin is a centibillionaire and among the richest people in the world.[2][3]