Mark lives in Watertown, MA, with his life partner, Diana Kierein, a social worker and attorney. Mark has a married son, Clay, who's a working musician in North Carolina. Mark and Diana share four children, three grandchildren, and Charlie, the cutest cockapoo on Earth.
He was a Methodist as a young lad and a convinced Quaker during his Washington, DC days. He has identified as a Unitarian Universalist since his arrival in Boston in 2002. Mark enjoys gardening, travel, photography, reading, Words With Friends, and KenKen.