[2] He served as executive vice president, digital and print media[3] for ESPN from January 2012 through June 2017.

[5][6] Prior to ESPN, Kosner was vice president, TV programming and development for Sports Illustrated.

While at ESPN, Kosner oversaw recruitment and talent development of content teams, including Wright Thompson, Bill Simmons,[7] Zach Lowe, Ramona Shelburne, Bill Barnwell and Sambit Bal as well as specialists like Adrian Wojnarowski,[8] Matthew Berry and Darren Rovell.

Kosner's father, Edward Kosner, is a noted journalist who writes non-fiction book reviews for the Wall Street Journal and previously served as the editor in chief at Newsweek (where he led the magazine's coverage of the Watergate scandal), New York and Esquire magazines, and at the New York Daily News (where he led the newspaper's coverage during 9/11).

[19] He has also appeared on lists of powerful and influential figures in sports media in Business Week Magazine, Daily Variety, Cynopsis, and Cablefax.