Alexander Dmitrievich Wentzell (Александр Дмитриевич Вентцель, born 16 February 1937, Moscow) is a Russian-American mathematician.
Wentzell graduated from Moscow State University in 1958 and received in 1964 his Russian candidate degree (similar to Ph.D.) from the Steklov Institute in Moscow with advisor Eugene Dynkin.
[1] He taught from 1961 as a docent at Moscow State University and from 1966 to 1991 as an assistant professor.
[2] His research deals with stochastic processes, probability theory, functional analysis, and partial differential equations.
In 1978 he was an Invited Speaker at the International Congress of Mathematicians in Helsinki.