Senior EVP and Head of Community Banking, Wells Fargo, 53
The former head of Wells Fargo’s brokerage business, Mack was named to run the company’s community banking arm in July, replacing the retiring Carrie Tolstedt. That puts Mack in charge of the largest retail bank chain in the U.S., with more than 6,000 branches in 39 states and D.C., along with 94,000 employees. Though online banking and low interest rates have caused other banks to close sites, Wells Fargo has defended its expansion. Still, the $49.3 billion division’s profits fell 1.4%, to $13.5 billion, in 2015.