Who became the leader of the provisional government after czar Nicholas 2 quit as the leader of Russia?

They aren't revolutionaries in the true sense of the Word but first Prince Georgy Lvov and then Alexander Kerensky led the Russian Provisional Government after the Tsar abdicated in March 1917.

Vladimir Lenin is the Russian revolutionary who took control of the country in October 1917 (O.S.) by ousting the Provisional Government