Wiki information Leontyevich:

Vladimir Leontyevich Komarov
Botanist, Deceased Person, Person

Vladimir Leontyevich Komarov was a Russian botanist. Until his death in 1945, he was senior editor of the Flora SSSR, in full comprising 30 volumes published between 1934–1960. He was elected a corresponding member of the Russian Academy of Sciences...

Mikhail Mil
Aerospace Engineer, Inventor, Person, Deceased Person

Mikhail Leontyevich Mil was a Soviet aerospace engineer. He founded the Mil Moscow Helicopter Plant, which is responsible for many well-known Soviet helicopter models.