Steve Mandel is an American hedge fund manager, investor, and philanthropist. He founded Lone Pine Capital in 1997, after working as the managing director at Tiger Management. According to Forbes Magazine, Mandel has a net worth of $3.9 billion as of October 4, 2021, where he ranked the 289th richest person in the United States in 2021 gaining ten spots on the list and an increase of $1.1B in Net Worth when compared to being the 299th richest person in 2020 ($2.9B Net Worth at the time) according to The Forbes 400 2021 List.