Joan Lyn Slonczewski is an American microbiologist at Kenyon College and a science fiction writer who explores biology and space travel. Their books have twice earned the John W. Campbell Memorial Award for Best Science Fiction Novel: A Door into Ocean (1987) and The Highest Frontier (2011). With John W. Foster and Erik Zinser, they coauthor the textbook, Microbiology: An Evolving Science (W. W. Norton) now in its fifth edition.