Gregory Maguire

From Goodreads:
Gregory Maguire is an American author, whose novels are revisionist retellings of children’s stories (such as L. Frank Baum’s The Wonderful Wizard of Oz into Wicked). He received his Ph.D. in English and American Literature from Tufts University, and his B.A. from the State University of New York at Albany. He was a professor and co-director at the Simmons College Center for the Study of Children’s Literature from 1979-1985. In 1987 he co-founded Children’s Literature New England (a non-profit educational charity).
Maguire has served as artist-in-residence at the Blue Mountain Center, the Isabella Stewart Gardner Museum, and the Hambidge Center. He lives in Concord, Massachusetts.