He prepared at Baltimore Friends School, where he was senior class president, captain of the football team, wrestled, and played lacrosse.
At Princeton, he majored in religion and wrote his senior thesis on Quakerism. He joined Ivy Club, played varsity lacrosse all four years, and participated in freshman wrestling and rugby.
After two years as a lieutenant in the Marine Corps, Clark earned an MBA at the Wharton School of the University of Pennsylvania. He worked for Alcoa in Buffalo, N.Y., for a short time but soon returned to Baltimore, married Martha “Skipper” Gilbert in 1959, and began his career in investment securities. He worked with Thomson & McKinnon Auchincloss Kohlmeyer and later at Baker Watts, Legg Mason, Alex. Brown & Sons, and Ferris Baker Watts. He served as governor of the National Association of Securities Dealers in the 1970s and later as an arbitrator in disputes before the association.
Clark was a sports fan and enjoyed playing tennis and paddle tennis. He was an avid deep-sea fisherman and pursued the sport off the Delmarva Peninsula, and North Carolina’s Outer Banks and the Duck-Corolla area.
Martha, his wife of 63 years, died of liver disease two weeks before him. Clark is survived by daughters Whitney and Peyton, son Gilbert, and three grandchildren.