Mendlesohn is a fan who was Professor and Head of the Department of English, Communication, Film and Media at Anglia Ruskin University. She was previously Reader in Science Fiction and Fantasy Literature in the Media Department at Middlesex University. She writes on the history of American religions and British and American SF and fantasy. She received her D. Phil. in History from the University of York in 1997.
She was the editor of Foundation — The International Review of Science Fiction from 2002 to 2007.
- 2001 Best Related Book Hugo
- 2005 Best Related Book Hugo — <winner> for The Cambridge Companion to Science Fiction
- 2009 Best Related Book Hugo
- 2013 Best Related Work Hugo