Derek Kelly (born March 15, 1964) is an American actor best known for his role in the TV series Third Watch. He is a real life firefighter in the FDNY, having worked at Engine Company 258/Ladder 115, in Queens. This house also was used in the show for exterior shots. Derek is married to former fellow cast member, Molly Price, together they have a son named Jake who was born in November 2003.