William J. "Bill" Birnes (born November 7, 1944) is an American author, editor, publisher and literary rights agent. A graduate of New York University, he holds a Ph.D in medieval literature (with a dissertation on Piers Plowman) from the same institution (1974) and later earned a J.D. degree from Concord Law School.
As a writer of popular nonfiction, he co-authored The Riverman with detective/academic Robert D. Keppel (1995), an account of serial killer Ted Bundy's involvement in the apprehension of Green River Killer Gary Ridgway. The book was adapted into a made-for-TV film (2004) on A&E. Following the publication of The Day After Roswell (1998), a collaboration with Philip J. Corso, Birnes has emerged as a prominent UFOlogist.
In his previous career as a literary scholar, Birnes served as a Lily Postdoctoral Research Fellow at the University of Pennsylvania and taught literature and linguistics at Trenton State College.
He has appeared on the History Channel's television documentary series: UFO Files (2004-2007), Ancient Aliens (2009-2013), NASA's Unexplained Files and I Know What I Saw. He starred in UFO Hunters (2008-2009) as leader of an investigative team of fellow ufologists.
- The Day After Roswell (1998) with Philip J. Corso ISBN 0-671-00461-1
- Star Trek Cookbook (1999) with Ethan Phillips
- Unsolved UFO Mysteries (2000) with Harold Burt
- The UFO Magazine UFO Encyclopedia (2004)
- Space Wars: The First Six Hours of World War III (2007) with William B. Scott, Michael J. Coumatos ISBN 0-7653-1087-2
- Worker in the Light: Unlock Your Five Senses And Liberate Your Limitless Potential (2008) with George Noory
- Serial Violence: Analysis of Modus Operandi and Signature Characteristics of Killers (2008) with Robert D. Keppel
- The Haunting of America: From the Salem Witch Trials to Harry Houdini (2009) with Joel Martin & George Noory
- Journey to the Light: Find Your Spiritual Self and Enter Into a World of Infinite Opportunity (2009) with George Noory
- Counterspace: The Next Hours of World War III (2009) with William B. Scott & Michael J. Coumatos
- UFO Hunters (2009)
- George Noory's Late-Night Snacks: Winning Recipes for Late-Night Radio Listening, with George Noory (2013)
- The Haunting of Twenty-First-Century America with Joel Martin (2013)