Jeremy Rosen's thinking was strongly influenced by his father, who rejected fundamentalist and obscurantist approaches in favour of being open to the best the secular world has to offer while remaining committed to religious life.
He believed in keeping the school small and selective, and sought to maintain the goals of high academic and cultural standards, while also upgrading the quality of the Jewish education.
Constant financial pressure, as well as difficulties in finding competent Jewish staff, eventually led Rabbi Rosen to resign in 1984.
[citation needed] He took a sabbatical in Israel, where he lectured at the WUJS Institute in Arad and at Ben Gurion University of the Negev with Rabbi Pinchas Hacohen Peli.
[citation needed] He became Chief Rabbi Jackobovitz's cabinet member for Interfaith Affairs, which he regarded as his one concession to the mainstream United Synagogue.
[citation needed] After helping as a temporary rabbi during the transition, he moved to Antwerp, Belgium, where he became chairman of the Faculty for Comparative Religion (F.V.G.).
In 1997, Rosen moved to New York, where he worked as an educational and rabbinic consultant, teaching and advising schools and communities on developing new programs and improving their performance.
[citation needed] He returned to London in 1999 to head the British branch of the Yakar Educational Foundation, which had been founded by his younger brother, Michael (Mickey) Rosen, to further the teachings of their late father.
[citation needed] In 2007 Rosen retired to New York City, but in 2009 accepted the position of rabbi to the Persian Jewish Center of Manhattan.