Jack Carroll "Jay" Haldeman II (December 18, 1941 – January 1, 2002) was an American biologist and science-fiction writer. He was the older brother of SF writer and MIT writing professor Joe Haldeman.
Jack Haldeman studied environmental engineering and biology at the University of Oklahoma, and received a degree from Johns Hopkins University. His scientific career included work in parasitology, field studies of whales in the Canadian Arctic, study of the greenhouse effect, and coordination of a website and a CD-ROM relating to agriculture in Florida. The tapeworm Hymenolepis haldemani was named after him.
Haldeman published at least 75 short stories, beginning with "Garden of Eden" in the magazine Fantastic (December 1971). He is notable for writing science fiction with sports themes; "Home Team Advantage", first appearing in Isaac Asimov's Science Fiction Magazine in 1977, has been anthologized a number of times. "High Steel", a 1982 story co-authored with Jack Dann, was a Nebula Award nominee; it was later expanded into a novel.
Haldeman became a member of the Science Fiction Writers of America in 1971, and went on to chair eight SF conventions. He was married to writer Barbara Delaplace; they collaborated on stories beginning with "That'll be the Day" in the anthology Alternate Tyrants.
Haldeman died of cancer in 2002, at the Hospice of North Central Florida in his hometown of Gainesville, Florida.
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