Sergius Bulgakov

Sergei Nikolaevich Bulgakov (/bʊlˈɡɑːkəf/;[1] Russian: Серге́й Никола́евич Булга́ков; 28 July [O.S. 16 July] 1871 – 13 July 1944) was a Russian Orthodox Christian theologian, philosopher, and economist.