Champion is active in many charitable organizations in the New York City area including the National Multiple Sclerosis Society, March of Dimes, and "Stopping AIDS Together". He co-hosted the New York City Project's 2002 "Courage Awards". On 20 February 2013 "The Wall Street Journal" reported that a former Mets teammate of baseball player Mike Piazza's said in 2000 that Piazza and Champion were involved in a homosexual relationship. Piazza denied this in 2002. Champion and his longtime partner Rubem Robierb were married on December 21, 2012. 