He was chief architect of the Temple Mount Excavations, directed by the late Prof. Benjamin Mazar, and of the Jewish Quarter Excavations in the Old City of Jerusalem, directed by the late Prof. Nahman Avigad, both of the Hebrew University. Together with his wife, Kathleen, he runs a firm called Ritmeyer Archaeological Design, which produces teaching and learning tools used throughout the world and offers consultancy on archaeological background and illustration. In 2006, his major work, The Quest: Revealing the Temple Mount in Jerusalem, was published after thirty years of intensive research.