Dr. Krueger graduated from Harvard Medical School in 1977, and completed a residency in internal medicine and became board certified in internal medicine in 1980, and completed a psychiatric residency and became board certified in psychiatry in 1984. He has additional qualifications, being board certified in forensic psychiatry and addiction psychiatry.He has assessed and treated individuals who are sex offenders or who have paraphilias for the past 20 years. He has published on the use of antiandrogen medication to treat such conditions and has continuing research interests in the pharmacological treatment of compulsive and aggressive sexual behavior. For the past 20 years he has been Medical Director of the Sexual Behavior Clinic at New York State Psychiatric Institute, where he consults to the New York State Office of Mental Health on the care of sex offenders and performs risk assessments.He is involved as a teacher and supervisor in the New York Presbyterian forensic psychiatric fellowship. He was on the DSM-V Workgroup for Sexual Disorders and is currently on the WHO Workgroup which is revising the Sexual Disorders Section of ICD-10