Margaret studied Art History at Smith College, and subsequently received a degree from the New York School of Interior Design. She worked for the industrial design firm, Raymond Loewy/William Snaith, and the department store chain, May Company Department Stores. She started her own interior design practice in 1972, focusing on design for private residences and academic institutions (eg. Wellesley, Bowdoin). She has served on several boards, including Greater Portland Landmarks, Waynflete School, Maine Historical Society, Maine College of Art.