Kan 1987, pigmukna ni Maguire an nonprofit educational charity, Childrens Literature New England, Inc., asin co-director sa laog nin 25 na taon.[1] Nagi man syang board member kan National Childrens Book and Literacy Alliance,[3] asin nagserbe man na board sa Isabella Stewart Gardner Museum, Board of Associates sa Boston Public Library, sa Concord Free Press, asin iba pa.