Leonid Konstantinovich Samsonov.

He is from Moscow. USSR Master of Sports. National champion in SHKGM with sidecars in class 750 cm3, and winner in classes 500 and 350 cm3. Armed forces championship winner and medalist. He also performed in motocross.
As a sidecar driver, he performed in crews with Oleg Chesnokov and Valery Alfeev.

source: USSR Sportsbikes