From 1992 to 2002 investigative journalist Christopher O'Brien
investigated and/or logged hundreds of unexplained events reported in the
San Luis Valley—located in South-central Colorado/North Central New
Mexico. Working with law enforcement officials from area counties,
ex-military members, ranchers and an extensive network of
skywatcher/investigators, he documented what may have been the most
intense wave of unexplained activity ever seen in a single region of North
America. His ten-plus year investigation resulted in the three books of
his “mysterious valley” trilogy, The Mysterious Valley, Enter the Valley,
(both St Martins Press) and Secrets of the Mysterious Valley. His field
investigation of UFO reports, unexplained livestock deaths, Native
American legends, crypto animals, secret military activity and the
folklore, found in the world's largest alpine valley, has produced one of
the largest databases of unusual occurrences gathered from a single
geographic region.

His new book Stalking the Herd (600 pages 2014) is the most comprehensive
book ever written on the subject of “cattle mutilations.” It is destined
to become the go-to textbook examining this complicated mystery.

His recent book Stalking the Tricksters, released by Adventures Unlimited
Press (2009), distills his years of field investigation and research into
an ingenious unified field theory that addresses the apparent
interrelatedness between divergent paranormal phenomena.

O’Brien has appeared on over 70 TV show segments and documentaries and
hundreds radio programs around the world including, Ancient Aliens, Coast
to Coast, UFO Hunters, Inside Edition, Extra, Sightings, Unsolved
Mysteries, Unexplained Files and his investigations have been featured by
the History, Learning, Travel and Discovery Channels, the BBC, Nippon TV,
the Associated Press, Denver Post, Albuquerque Journal, Fate, UFO Magazine
and many other publications and media outlets too numerous too mention.

He has location-scouted, field-produced, supplied footage for dozens of
production companies and directed two segments for the TV show Strange
Universe. He is currently an associate producer for Ronald James Films,
and his film (co-produced with Ron James and Jennifer Stein) “It Could
Happen Tomorrow” won two 2012 EBE film festival Awards—for Best Feature
and The Peoples Choice Award.