29. Abigail Johnson
Johnson took full command of her family’s mutual fund giant Fidelity Investments in December 2016 when she was named chairman, a job previously held by her father, Ned Johnson (No. 62), for nearly 4 decades. Johnson, who owns approximately one fourth of the company, has been CEO since 2014. Fidelity, which was founded by her grandfather in 1946, is the nation’s second-largest mutual fund giant (behind Vanguard), with nearly $2.3 trillion in managed assets. Johnson reportedly worked summers at Fidelity throughout college and joined full time in 1988 after receiving an M.B.A. from Harvard.