He was best known as the editor or co-editor of literally hundreds of anthologies of short fiction, often in collaboration with well-known writers such as Robert Silverberg, Jane Yolen, and Mike Resnick. He famously co-edited over 125 anthologies with Isaac Asimov. He also co-edited a large number of anthologies with scholars such as Charles G. Waugh, Joseph D. Olander, and/or Patricia Warrick. A holder of a doctorate in political science, Greenberg taught at the University of Wisconsin from 1975 until his retirement in 1996. In 2001, he founded book packaging company Tekno Books.Greenberg edited many, many books and most were not fairy tale related, but here are some of my favorites with those themes. I'm sure I am missing some, but this is a great place to start with some wonderful stories to be found.