As a professional writer since 1978, Mr. Christensen has penned over 70 published books with six publishers, dozens of magazine articles, and edited a police newspaper for seven years. He has written on the martial arts, the paranormal, missing children, street gangs, school shootings, workplace violence, riots, police-involved shootings, nutrition, exercise, prostitution, and various street subcultures. Of late, he has been writing an award-winning police thriller fiction series called Dukkha. His short stories—OLD ED, BOSS, and Parts—are popular among fans of gritty action.

His books have been translated into five languages. Policing Saigon and On Combat are also published as audio books.

The Masters Hall of Fame inductee began training in the martial arts in 1965 and continues to this day. Over the years, he has earned a 1st-degree black belt in arnis, a 2nd-degree black belt in jujitsu, and in 2018, the American Karate Black Belt Association awarded Loren a 10th-degree black belt in karate. As a result of his tour in Vietnam and nearly three decades in law enforcement, Mr. Christensen's focus in the martial arts—writing, teaching, and training—has always been on street survival, not competition. He has starred in seven martial arts training videos.

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Dr. Alexis Artwohl is a retired clinical and police psychologist who provided traumatic incident debriefings to numerous public safety personnel and citizens in the Pacific Northwest. She co-authored two books with Loren Christensen, published research in the FBI Law Enforcement Bulletin and the Law Enforcement Executive Forum, contributed chapters to books, and authored magazine articles. She has provided training to law enforcement since 1990 and applies the lessons learned from police combat to CCW training as well. Her website is www.alexisartwohl.com

I never set out to work with police officers or write any books. Early in my career, fate led me to connect with veterans and police officers. Inspired by their courage and resiliency, I knew I had found my calling as a clinical psychologist specializing in recovery from trauma. The officers themselves were the impetus for the book. I viewed my task as a traumatic incident debriefer as primarily that of a trainer: to educate officers about human performance research, especially performance under stress. They are the ones who asked me to start training their colleagues in the classroom. They also encouraged me to put the information into a book.

At the same time, my co-author Loren Christensen asked if he could interview me for a book he wanted to write about officer-involved shootings. I told him I was also considering writing a book to so we teamed up, and the first edition of Deadly Force Encounters was born.

The human performance factors we discuss in both editions of Deadly Force Encounters are timeless. They apply to people from all walks of life as they negotiate the perils of life on Earth. We hope you find insights that will help you with your journey. First responders, veterans, and citizens honored us by sharing their stories with us. There was room for only a few in the books, but everyone's voices echo throughout nevertheless. We thank everyone who steps up to the plate to make their community a better and safer place.