Mark Langan retired after a twenty-six-year career with the Omaha Police Department. In 1978 Mark was the youngest police officer ever hired on the Omaha Police Department at age eighteen. He worked as a uniformed officer and as a detective in the Burglary, Vice, and Narcotics Units. Mark was promoted to the rank of sergeant in 1988, working as a supervisor in the Narcotics Unit until his retirement in 2004.

During his career Mark wrote nationally published articles on various law enforcement topics and lectured throughout the country. Recognized as a court-authorized expert on narcotics investigations, Mark testified hundreds of times in both state and federal court.

Mark is certified in teaching workplace violence and active shooter training for employees in private corporations.

He has appeared on national news programs including The Nancy Grace Show, CNN, and The Today Show.

Mark was awarded the Omaha Police Department's highest honors: the Medal of Valor and the Distinguished Service Medal for his work in the Narcotics Unit.

From 2000 to 2008 Mark was appointed by the Governor to the Judicial Nominating Commission and was involved in selecting candidates for judgeships in Nebraska.

Mark recently left his second career as Vice-President of Field Operations for the Nebraska Humane Society where was responsible for the investigation of crimes involving animals.

He is a recognized national speaker on active shooters and testimony tips for law enforcement officers.

Mark and his wife, Annette, live in Omaha, Nebraska.