Science fiction writer and computer programmer. He was raised in a Latter-day Saint household, the oldest of eight children. He attended Clarion in 1985. In 1986, he served a mission to Canada for The Church of Jesus Christ of Latter-day Saints, but was arrested for making a false bomb threat, for the purpose of preventing his fellow missionary from returning home.
Shunn's first professional short story was published in The Magazine of Fantasy & Science Fiction in 1993. He has been nominated once for the Hugo Award and twice for the Nebula Award. In the wake of the September 11, 2001 attacks, he created what may have been the first online survivor registry. Beginning in 2010, he was the host of Tuesday Funk in Chicago.