Doctor of Medicine, State University of New York Downstate Medical Center, Brooklyn, 1982. Master in Public Health in Health Policy and Management, Columbia University, New York City, 1991.
Intern/resident internal medicine Long Island Jewish Medical Center, 1982—1985. Fellow epidemiology & public health Epidemic Intelligence Service, Center's for Disease Control & Prevention, 1985—1987. With New York City Department Health & Mental Hygiene, since 1987, various positions including director Office Acquired Immune Deficiency Syndrome Research, assistant commissioner Bureau Sexually Transmitted Diseases, director emergency preparedness activities, since 1999, agency incident Commander for World Trade Center disaster, deputy commissioner disease control, since 2002.
Associate professor clinical public health of epidemiology Columbia University Mailman School Public Health. Faculty Johns Hopkins School Public Health, Baltimore.
Married Evelyn Horn; children: Ari, Lois.