Mosey Kirshteyn was born in Baku, Azerbaijan on December 26, 1930 to mother Feigha and father Mordechai (native of Kherson, Ukraine). He graduated from "Oil and Chemistry Production" University with a degree in Engineering. He worked as an engineer doing construction management for a number of years until he joined the Food Production Ministry where he achieved the post as the head of the construction department. He received a number of major medals and eventually received the title of "Honorable Engineer of Azerbaijan".
He married Rebecca Berman in 1952 in Baku, had two sons Yakov and Boris. He was a very proud grandpa of Mark and Sam and an even prouder great-grandpa of Ari, Eliana, Zeke and Aden.