From a story on petapixel.com by Jason Schneider headlined “White House Photographer Discusses His Time Covering 7 Presidents”:

Pulitzer Prize winner Doug Mills has been a photojournalist for nearly four decades and has been responsible for photographing everything from major sporting events to seven different presidents of the United States. He is currently a photographer for the Washington bureau of the New York Times and has been in that position since 2002. Prior to that, he worked for 15 years as the chief photographer for The Associated Press in Washington, which he joined after working for four years in the Washington bureau of United Press International.