Harvey Schlossberg (January 27, 1936May 21, 2021) was a New York City Police Department (NYPD) officer, Freudian psychoanalyst, and the founder of modern crisis negotiation. He founded the Psychological Services Department in the NYPD, where he pioneered treatment for violence-prone police. In the Handbook of Police Psychology, Schlossberg was called a "father of modern police psychology" for his role in changing the tactics police employed in hostage situations. Early life Schlossberg was born in Manhattan on January 27, 1936. His father, Harry, worked as a mechanic; his mother, Sally (Frankel), was a housewife. His family was Jewish, and his grandparents immigrated to the United States from Eastern Europe. He attended Eastern District High School in Brooklyn, before studying chemistry at Brooklyn College. After graduating with a bachelor's degree in 1958, Schlossberg joined the NYPD to fund his postgraduate studies. He went on to obtain a master's degree in psychology from Long Island University, and was awarded a doctorate in clinical psychology from the Graduate School of Arts and Sciences at Yeshiva University in 1971. Career NYPD Schlossberg first worked as a traffic officer in the accident investigation unit. He was later moved to the Medical Bureau after commissioner Patrick V. Murphy learned that he had a doctorate in psychology. There, he performed emotional testing to assess the well-being of prospective and current colleagues in the NYPD, and was made director of psychological services in 1974. He helped resolve the 1973 New York City hostage incident, coined the term Stockholm syndrome, and helped catch serial killer David Berkowitz. The NYPD Hostage Negotiation Team was the brainchild of NYPD chief Simon Eisdorfer, with Schlossberg responsible for formulating the team’s strategy. He advocated containing a hostage situation to a restricted area, with police starting negotiations, keeping up communications with the hostage-takers, and gaining their trust in the hopes that they would change course and free their captives. He trained over 70,000 crisis negotiators globally, and his theories were eventually adopted by the Federal Bureau of Investigation. Schlossberg was credited with helping to save over 40,000 lives globally with his tactics. 1973 hostage-taking During the 1973 hostage-taking in Brooklyn, the longest in NYPD history, twelve hostages were taken by four gunmen, who vowed to fight to the death. Schlossberg spent 14 hours assessing their psychology and advising NYPD officials on what to do next. He called the hostage-takers' bluff when they requested a doctor