Seanan McGuire has earned nine nominations, the most of any author; Robert Silverberg has earned eight, Nancy Kress seven, and Heinlein, George R. R. Martin, Kim Stanley Robinson, and Lucius Shepard six, the only authors besides Willis to get more than five.
Hugo Award nominees and winners are chosen by the supporting and attending members of the annual World Science Fiction Convention, or Worldcon, and the presentation evening constitutes its central event.
The selection process is defined in the World Science Fiction Society Constitution as instant-runoff voting with six nominees, except in the case of a tie.
These novellas on the ballot are the six most-nominated by members that year, with no limit on the number of stories that can be nominated.
[3] Initial nominations are made by members in January through March, while voting on the ballot of six nominations is performed roughly in April through July, subject to change depending on when that year's Worldcon is held.