Leonid Mozgovoy was born on April 17, 1941 in Tula.

In 1961-1965 he studied at the Leningrad state Institute of theater, music and cinematography (LGITMiK) at the faculty of dramatic art (course of Professor B. V. Zona). His fellow students were Olga Antonova, Lev Dodin, Viktor Kostetsky, Sergei Nadporozhsky, Natalia Tenyakova, Vladimir Tykke. About his teacher and the learning Process L. Brain recalls in detail in the book "School of Boris". Lessons of acting and directing" (St. Petersburg., 2011.).

From 1965 to 1970 he worked at the Leningrad theatre of musical Comedy. In 1967 he became a Laureate of the Leningrad competition of artists-readers[4]. He is well known as an actor of literary variety, for many years he successfully works in " Lenkontsert "(now - "Petersburg-concert"). Popular is his one-man show "Funny" by F. M. Dostoevsky in the St. Petersburg classical theater.

His debut work in film was the role of A. p. Chekhov in the film "Stone" by Alexander Sokurov[5]. He became a favorite actor of the Director, starring in his paintings "Moloch" (Hitler) and "Taurus" (Lenin).