Before coming to Congregation B'nai Jeshurun in New York City, Marcelo Bronstein held a variety of positions, both in the Jewish and secular worlds. As Youth Director at Comunidad Bet El in Buenos Aires, he worked closely with his teacher and mentor, Rabbi Marshall T. Meyer for ten years. After serving as co-director and, later, director of Camp Ramah in Argentina he went on to the position of Youth Director, Student Rabbi and Director of Talmud Torah, Nueva Comunidad Israelita in Buenos Aires.
In the field of psychology, Rabbi Bronstein continued to be trained and had a clinical practice in the Department of Pediatric and Adolescent Psychology at the University of Buenos Aires Medical School and at the Centro Medico Psicologico, Buenos Aires. At the Seminario Rabinico Latinoamericano in Buenos Aires, he became Professor of Group Dynamics and Evolutionary Psychology and also conducted a private practice specializing in teenagers.
In 1989 Rabbi Bronstein became rabbi of Estadio Israelita in Santiago Chile and founded and held the position of rabbi of Congregacion Or Shalom in Santiago. In 1995 he joined Rabbi Roly Matalon as co-rabbi of Congregation B'nai Jeshurun.
Rabbi Bronstein served on the boards of many agencies in Chile and Argentina concerned with issues of social action, health, ecology and Jewish-Christian, and human rights relations. He is currently on the advisory committees of Human Rights Watch/Americas, the advisory boards of the Chaplaincy Program at Roosevelt St. Lukes Hospital, New York, Jews for Racial and Economic Justice, Soaring Words and South Wing to Zion (Ethiopian Jews).
Rabbi Bronstein is married and has three daughters.