A.D. Miles Returns as Head Writer of 'The Tonight Show Starring Jimmy Fallon', Replacing Mason Steinberg

Miles, who served as the head writer for "The Tonight Show" from 2014 to 2017 and for "Late Night with Jimmy Fallon" from 2009 to 2014, is set to replace Steinberg after a year, marking the latest in a series of behind-the-scenes changes.