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After six months in hospital, he returned, on crutches, to study four more years in Yeshivat Mercaz HaRav, under the tutelage of Rabbi Tzvi Yehuda Kook and Mazkir Bnei Akiva Shlomo Aviner. In 1977, he joined the group that established the Beit El settlement in the West Bank. In 1978, Katz, together with his Rabbi Zalman Baruch Melamed, split with the Beit El group and founded a new settlement which was called "Beit El B". Katz was one of the original members of the Gush Emunim movement.