Career
From 1966 to 2008 he was a professor of English at the University of Hawaii at Manoa. The author of eight novels and six short story collections, MacMillan founded the literary journal Hawaii Review in 1973. Beginning in 1992, he also served as the fiction editor for Manoa: A Pacific Journal of International Writing.
His work was anthologized in The Best American Short Stories and The Best of Triquarterly.
He was a graduate of the State University of New York at Oneonta and the University of Iowa. He was further honored in 2010 by the creation of the Ian MacMillan Writing Awards in his memory at the University of Hawaii.