TAG Experts
TAG’s standards for experts are the highest in the world because our clients deserve the best possible guidance when they call for help in life-threatening situations. If you ask for full CV’s of experts you’re thinking of retaining, you’ll soon find that no other vendor comes close. To even be considered for training as a TAG Expert we require:
- Education: A doctoral degree plus clinical and forensic training or a masters degree plus a minimum of two years of FBI training in criminal behavior analysis
- Experience: More than 20 years experience with a minimum of 1,000 violent offenders and experience as an expert witness in the courtroom
- Reputation: Be among the top ten national experts in forensic psychiatry, forensic psychology, or criminal behavior analysis
- TAG Training: Completion of TAG’s courses and instruction in TAG’s methods of case management
Our Experts are listed below:
- Park Dietz, M.D., M.P.H., Ph.D
- John Bradford, M.B., Ch.P.
- Joel Dvoskin, Ph.D, A.B.P.P.
- Graham D. Glancy, M.B., Ch.P.
- Daniel A. Martell, Ph.D.
- Daryl Matthews, M.D., Ph.D.
- Gregg O. McCrary, M.A.(FBI, ret.)
- Steven E. Pitt, D.O.
- James A. Wright, M.P.A. (FBI, ret.)
- Ronald P. Walker, M.A. (FBI, ret.)
- Erin Nelson, Psy.D.
- Bill Irwin (FBI, Ret.)

Mr. Irwin is available for speaking or training engagements for corporate, college, or government agency audiences regarding: