Born in New York City, he has been a resident of the Pioneer Valley for over 45 years, all but four of those in Northampton. The author of three books, articles and chapters on family and couples therapy, more recently his writing focuses on individuals who think big and get carried away. These include cluster balloonists; members of an all-volunteer aerospace program; and visionary builders – individuals who spend decades creating monumental, idiosyncratic art environments in their homes and yards. For Mark, the arrival of Northampton Neighbors was an answered prayer – a chance to help create an extended community in which people can be where they want to be and can help each other out.