Nikolai Lebedenko

Nikolay Lebedenko (Russian: Никола́й Лебеде́нко) was a Russian military engineer, mostly known as the main developer of the Lebedenko Tank, or the Tsar Tank, which was the largest armored vehicle in history, constructed in 1916–1917. Lebedenko was employed in a private firm, that worked for the Russian War Department, designing artillery devices before and during World War I.

...
Wikipedia