|Known for||24 Hour Fitness|
The 24 Hour Fitness began in 1983 as a one-club operation called 24 Hour Nautilus. Mark Mastrov and Leonard Schlemm began the firm, with Mastrov and Schlemm remaining to continue its expansion.
In 1998 David Giampaolo and Mark Mastrov co-founded Fitness Holdings Europe, a private-equity-backed investment vehicle, to open and acquire small chains of European health clubs. Fitness Holdings Europe was merged into 24 Hour Fitness Worldwide, Inc. in 2000. In 2010 Mastrov founded Hard Candy Fitness with Madonna, her manager Guy Oseary.
Mastrov was born in 1958 in Oakland, California. He grew up in the San Francisco Bay Area and graduated from Castro Valley High School where he played point guard. He has a bachelor's degree in Business from California State University, Hayward.
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