(written from a Production point of view)
T.J. McGee is an actor and comedian who appeared as an assistant surgeon in the Star Trek: The Next Generation second season episode "Samaritan Snare". He received no credit for his appearance and was identified by the name tag of his costume which was sold off on It's A Wrap! sale and auction on eBay. 
McGee is a member of the religious comedy group Gospel All Star Comedians and toured with this group for the Bay Area Christian Entertainment in 2006. The group has also released several DVDs such as Holla!...The Lord Loves To Laugh Too! in 2003.
McGee has also performed in several television shows such as in the Matlock episode "The Priest" in 1989. Fellow Star Trek actors who appeared also in this episode are Steven Anderson, David Froman, Albert Hall, Elizabeth Hoffman, Michael Spound, Heidi Swedberg, and Daniel Roebuck.