In 1967, Siegel represented the Jewish community (and the Jewish faith) as the only rabbi to participate in an historic conference convened by the United States Navy, co-sponsored by the Chief of Chaplains, U.S. Navy, and the Commander, U.S. Submarine Force, U.S. Atlantic Fleet, on the subject of lay ministry.
A prolific writer, Siegel was the author of hundreds of articles, and the editor of two books, "Conservative Judaism and Jewish Law," and "God in the Teachings of Conservative Judaism."