Evelyn C. Leeper
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She and Mark have co-edited/co-published their weekly fanzine (the MT VOID) since 1978. As of October 10, 2014, it has had 1827 issues.
She is one of the judges of the Sidewise Award for Alternate History and a contributor to Uchronia: The Alternate History List. She has been nominated for the Hugo Award for Best Fan Writer twelve times (1990-2001), losing on each occasion to David Langford.