Marcus has two daughters, Karen and Debra, and one grand child, Isaac. Karen Singer is Principal and Artistic Director of Karen Singer Tileworks. Debra Singer is a photographer/designer focused on environmental advocacy. One of his closest friends was Claudia Card, Emma Goldman Professor of Philosophy, UW Madison,who he mentored since _her_ undergraduate years at UW. <sep>, Pronoun: her <sep>, A: Claudia Card <sep>, B: Emma Goldman