April 15, 2020. Husband of Dr. Laurie Robbins Appelbaum. Father of Karen (Michael) Pearce and Susan (Adam) Wolbransky. Brother of Margaret (late Sanford) Levine and Judy Appelbaum (Elizabeth Cohn). Grandfather of Isla. Graveside services are private. Contributions in his memory may be to the Wissahickon Valley Watershed Association, 12 Morris Road, Ambler, Pa 19002. or the Abramson Cancer Center at the University of Pennsylvania Hospital, 3400 Spruce Street, Philadelphia, Pa. 19104.