Who is Alexander Fedorovich Kerensky from Nicholas and Alexandra and what is their importance?

Alexander Fedorovich Kerensky was one of the leaders of the Russian Revolution. He came from the town of Simbirsk on the Middle Volga River where he grew up with Lenin since he was the administrator of the school that the young Lenin attended. Kerensky became known for his defense of political prisoners and for his investigations of social incidents. He is one of the members of the Duma. When revolution occurs, he's sent to investigate the captive Alexandra, who it was felt was engaging in pro-German activities. In May 1917, he became Prime Minister and Minister of War.