As a TAG Senior Analyst, Mr. Walker has provided expert consultation to hundreds of TAG’s corporate clients in the investigation, analysis, and management of threat cases. Mr. Walker has specialized expertise in conducting investigative interviews and in identifying unknown subjects responsible for sabotage, crime, defamatory statements, or anonymous threats.

As the 20th anniversary of JonBenét Ramsey's death approaches, multiple networks are set to release documentaries and TV specials that will delve into the still-unsolved case as new details continue to emerge. 

On Tuesday, Japan experienced a terrible incident of workplace violence when a terminated employee broke into his former workplace and killed 19 people and wounded 45 others.  He had provided the clearest warning imaginable, had been hospitalized briefly, and had been discharged from the hospital last March. 

Dr. Park Dietz discusses the terror attack that killed 84 in Nice, France.

A federal judge on Wednesday granted John Hinckley Jr., the man who shot President Ronald Reagan in 1981, "full-time convalescent leave" from St. Elizabeth's Hospital.

“Mass murderers have multiple motives. In this instance, we already have evidence that they included his radical jihadist beliefs, his conflicts over his own sexuality and religion and his rejection by men at the club, so the issue is not really motivation, it’s how did he get so angry and so willing to die that he engages in a very American version of mass murder." Dr Park Dietz

Dr. Park Dietz was named as one of the top ten psychiatrists of all time. He talks with Wallace Chapman about his career in criminology, what makes people kill, and how the media sometimes do harm through their reporting of mass shootings.

WARREN, Mich. – Dr. Joel Dvoskin, of the Threat Assessment Group, Inc., led the training and executive overview sessions.

Who’s responsible when a mass shooter attacks?
It’s a question that new claims against San Bernardino County are raising in the wake of the deadly terror attack at the Inland Regional Center on December 2, 2015.

Fears of gun violence, played out on a seemingly endless video loop in the mass media, appear to be driving more and more clients

What happened in San Bernardino strikes home with Americans precisely because it happened at work.

Dr Park Dietz talks to NPR about possible motives that led to this tragic event.

Forensic psychiatrist Park Dietz spoke with KCAL9's Amy Johnson about why the San Bernardino attack stands out from other mass murder.

According to Park Dietz, an academic and medical doctor who is the former chief fellow in forensic psychiatry at the University of Pennsylvania and principal of the Threat Assessment Group consultancy, the effort to cast the events into narrow and politically useful ideological frames is corrupting public discourse.

Park Dietz, who has been profiling mass killers for more than 30 years, said he was unaware of any case of a couple erupting in mass violence when the targeted victims were not family members or people perceived to have harmed their child.

Forensic psychiatrist Park Dietz has argued since the 1980s that the problem is cable TV’s “saturation coverage” with its electronic images, color, bleeding bodies and screaming sirens. 

Sensationalized and detailed media coverage of mass shootings may be contributing to copycat crimes, psychologists and other experts said this week.

By Park Dietz, M.D., Ph.D., TAG Founder

Since 9/11, U.S. corporations have taken a heightened interest in preparing for terrorist attacks, and increasing numbers of executives take advantage of the services of executive protection teams.  Those steps have never been more relevant than now, with the publication of the current issue of Inspire magazine, which urges the assassination of U.S. executives, both in the workplace and at more vulnerable locations.

Wednesday’s fatal shooting of a local TV reporter and cameraman in Moneta, Virginia, is raising questions about violence in the workplace. Authorities identified the gunman as Vester Lee Flanagan, a former employee of the same TV station, WDBJ.

Dr. Park Dietz explains mass murder in the selfie era, the psychological process and warning signs behind these incidents, and their great risk of inspiring copycat crimes due to widespread publicity and social media.