From 1927-1929 he worked as a press operator on "Electrosvet" factory, at the same time he attended photo courses at the Society of Friends of the Soviet cinema.

In February 1945 Boris Kosarev was sent as a photographer to the Crimea, to take official photos of the Yalta Conference, the meeting of Heads of governments of the United States, the Great Britain and the Soviet Union.

Created a gallery of photo portraits and genre scenes of life of the Soviet leaders, such as Khrushchev, Brezhnev, Andropov.

He made photos of the famous personalities - Sholokhov, Solzhenitsyn, Rostropovich, Bondarchuk, Maya Plisetskaya, Rockfeller[clarification needed] (how visited the USSR for the US exhibition of 1954).

Photo works "Snowing", "Before the Storm" and "The first space flight" were internationally awarded with medals and prizes Solo exhibitions: