Rabbi Geffen was named Rabbi of Temple Adas Israel in the summer of 2014. He was ordained by The Hebrew Union College­-Jewish Institute of Religion (HUC-JIR) in New York in May, 2014 and holds Masters Degrees in both Hebrew Literature and Jewish Education. During his time at HUC-JIR, Rabbi Geffen earned several awards, including those for Modern Hebrew, Halakhic Literature, Rabbinics and was twice awarded the “Amitz Lev” Prize for Spirit, Character and Strength of Heart. He earned his undergraduate degree in History from The University of Wisconsin, Madison. He was born and raised in New York City, where he attended the Abraham Joshua Heschel School and, later, the Fieldston School.

Prior to assuming his position at Temple Adas Israel, Rabbi Geffen served as the Rabbinic Intern for Woodlands Community Temple in White Plains, NY and Jewish Home Lifecare of Manhattan. He was also the Schusterman Rabbinic Resident at Temple Shaaray Tefila in New York City and the Administrative Education Intern at Leo Baeck Temple in Los Angeles.

Rabbi Geffen lives in North Haven with his beloved wife Lu (Temple Adas Israel Director of Community Engagement), their daughter Eva, son Emet and their dog Stuart.