Tamar Beer Horowitz founded Bnot Sinai in 2018, early on in her college career, in order to fulfill her dream of spreading batei midrash for women to her community. Tamar received her B.A. from Yeshiva University: Stern College for Women, with a major in Jewish Studies and a minor in English Literature. She received her M.A. from Yeshiva University's GPATS (Graduate Program for Advanced Talmudic Studies) and is currently studying at Azrieli Graduate School for Education and Administration. Tamar is an incoming Judaics teacher at Yavneh middle school, and enjoys giving shiurim in various communities. Tamar grew up in West Hempstead and attended Midreshet Shalhevet high school. She spent a year and a half in Midreshet Lindenbaum seminary before attending college, and now lives in Washington Heights.