Forensic & Clinical Psychology Services by Mark Zelig, Ph. D., ABPP is a renowned mental health services business that provides expert witness testimony, continuing education to psychologists, physicians, and attorneys, and consulting services to law enforcement and homeland security agencies. The business offers counseling, testing, and evaluations for individuals, as well as consultation to organizations. Dr. Zelig has separate board certifications in clinical psychology, forensic psychology, and police and public safety psychology, making him a highly qualified expert in his field.