The Reconstructionist Rabbinical Association is the professional organization of Reconstructionist rabbis. In contemporary Orthodox Judaism, women are forbidden from becoming rabbis or cantors. Christian scholars interested in the Bible consulted with Talmudic rabbis. Orthodox rabbis do not recognize conversions by non-Orthodox rabbis. It was dominated by the Hasidic "rebbes" and Lithuanian rabbis and "roshei yeshiva". The yeshiva served as the highest educational institution for the Rabbis of this period. Signatories include more than a hundred rabbis and laypeople. This has met with opposition from many other Orthodox institutions (see Women rabbis). Tolerance for LGBT and ordination of LGBT rabbis were also pioneered by the movement. Philo is evidently combining philosophy and Midrash, Plato and the rabbis . Aggadic expositors availed themselves of various techniques, including sayings of prominent rabbis. The signatures of more than 300 prominent rabbis were later obtained. He was quickly criticized by other conservatives, rabbis, and others. Some Conservative rabbis disagree with it, e.g. Isaac Klein. Two of the more prominent of these rabbis are Chuck Davidson and Haim Amsalem.