Len Blavatnik is an American businessman with an estimated net worth of $25.3 billion in July 2019. His wealth is mostly derived from his diverse investments in Europe, South and North America as well as Russia.

Of Jewish ancestry, Leonid Valentinovich Blavatnik was born on June 14, 1957 in Odessa, Ukraine. After attending Moscow State University of Railway Engineering, he moved to the U.S. and studied at Columbia University where he completed his masters degree in computer science. He also attended Harvard Business School where he finished his MBA.

It was in 1986 when he founded Access Industries, which is an international industrial group with holdings in Russia, South America, Europe and North America. Access Industries has investments in various industries which include coal, oil, aluminum, telecommunication, media, plastic, petrochemicals and real estate. Today, he sits as the group's president and chairman of the board.

Together with Viktor Vekselberg and Alfa Group, which was owned by Mikhail Fridman, AAR venture was formed. Len Blavatnik also holds interests in UC Rusal which is considered as the largest producer of aluminum in the world. He also sits in the board of the company.