Clark was born and raised in Annapolis, Maryland and received his BA in Sociology at the University of Maryland in 1971. After a brief two year stint as a social worker, he received his MS in Urban Affairs and Planning at the University of Wisconsin-Milwaukee in 1976. After three years of various internships and consulting jobs in the health and housing field, he landed at The National Research Council in the Data Processing Unit of the Office of Scientific and Engineering Personnel. Upon its dissolution in 1995 he joined the Associateship Program. He is now a Program Associate with that program working in the Operations Unit.
Interests outside the office include dining out, happy hours, general entertaining of all varieties, live music, movies, theater, travel and reading. More physical pursuits include some gym work on P1 and off and on again running. He has run several 10 milers, a few half marathons and many 10Ks but now limits himself to hitting the treadmill a couple times a week.