To be eligible for Nebula Award consideration a short story must be published in English in the United States.
Works published in English elsewhere in the world are also eligible provided they are released on either a website or in an electronic edition.
Soon after, members are given a month to vote on the ballot, and the final results are presented at the Nebula Awards ceremony in May.
Ten authors have won twice, with Karen Joy Fowler at seven and Gardner Dozois at six having the next highest nomination count after Ellison.
Michael Swanwick has the most nominations for short story without winning at six, and Howard Waldrop and Gene Wolfe are next with five each.