Joan (Brill) Marcus, 78, of Madison, Conn., and Lighthouse Point, Fla., died May 29. She was the wife of Joel Marcus. Born in New York, N.Y., she was the daughter of the late Martin and Anita (Levy) Brill. She was also predeceased by her son David S. Marcus. In addition to her husband, she is survived by her siblings, Steven Brill and Carole Brill.