While at The Los Angeles Times, he received the 2003 Pulitzer Prize for National Reporting, with Alan Miller, for their revelatory and moving examination of a military aircraft, nicknamed "The Widow Maker," that was linked to the deaths of 45 pilots.
He was a member of The New York Times reporting team that received the 2015 Pulitzer Prize for International Reporting for coverage of the 2014 Ebola virus epidemic in West Africa. Team members named by The Times were Pam Belluck, Helene Cooper, Sheri Fink, Adam Nossiter, Norimitsu Onishi, Sack, and Ben C. Solomon.
Before joining the Times, Sack was a national correspondent in the Atlanta bureau of The Los Angeles Times, Atlanta bureau chief and correspondent for The New York Times, and a reporter for The Atlanta Journal-Constitution.
- Nolan, Rachel (9 December 2013). "Behind the Cover Story: Kevin Sack on His Friendship with a Lost Boy". NY Times. The New York Times Company. Retrieved 21 April 2019.
- "Alan Miller and Kevin Sack". The 2003 Pulitzer Prize Winners. 2003. Archived from the original on 25 June 2015. Retrieved 21 April 2019.
- "The 2003 Pulitzer Prize Winners. National Reporting". 2003 Pulitzer Prize. 2003. Archived from the original on 24 April 2009. Retrieved 21 April 2019.
- "The 2015 Pulitzer Prize Winners. International Reporting". 2015 Pulitzer Prize. 2015. Archived from the original on 28 August 2015. Retrieved 21 April 2019.
- "2015 Pulitzer Prize Winners in Journalism, Letters, Drama and Music". NY Times. The New York Times Company. 20 April 2015. Retrieved 21 April 2019.