In 1965, Liebman published a pioneering essay, “,” in the American Jewish Year Book. His 14 books include Ambivalent American Jew: Politics, Religion, and Family in American Jewish Life. According to Cohen, Liebman "argued that American Jews struggle to integrate into the larger society while trying to maintain a distinctive group identity." According to Orthodox Rabbi Reuven Bulka, "Liebman's exhaustive study was an eye-opener for many who had dismissed Orthodoxy as a negligible force on the American Jewish scene and also was a partial harbinger of much more literature on Orthodoxy which has proliferated ever since." In a provocative paper, "," Liebman analyzes religiousextremism in Israel and argues that "religious extremism is the norm and that it is not religious extremism but religious moderation that requires explanation." A critical respondent appreciated the description of Israel but rejected Liebman's generalization as begging the question of whether "extremism should be regarded as "normal religion or even religion at all". In a 1990 study of American and Israeli Judaism, Liebman articulated a concept of "Jewish personalism" which, writes his co-author, is "the tendency of American Jews to pick those parts of Judaism they find personally meaningful, rather than complying with external requirements of religious law, Zionist ideology or ethnic obligation". He was born in New York City and attended secondary school at the Gymnasia Herzliya in Tel Aviv. He earned degrees from the University of Miami and University of Illinois. He moved to Israel in 1969. With his wife Carol, he had three children. He was an observant Jew, concerned about intermarriage, served in the Israeli Defense Forces on an education unit, and was politically a dove regarding Israel. Personally, Liebman is said to have had a "fierce devotion to honesty, even at the risk of unpopularity". For example, in a book review, he writes: "If a can't be kind he must be fair. I find it impossible to be kind to an author who writes.... a statement comparable to saying that an American state is located somewhere between New York and California.... Since I cannot be kind I will try very hard to be fair. The book does have redeeming features". In November 2007, the Jewish Theological Seminary published a memorial volume, Ambivalent American Jew: Politics, Religion, and Family in American Jewish Life. According to an obituary in The Forward, "Liebman was widely regarded as the pre-eminent social scientist of Jews and Judaism in the latter third of the 20th century".
Liebman, Charles S. and Elihu Katz. The Jewishness of Israelis : Responses to the Guttman Report. SUNY Series in Israeli Studies. Albany: State University of New York Press, 1997.
Liebman, Charles S. and Śarah Libman. Nośʼim Nivḥarim Ba-Havanat Ha-Ḳehilah Ha-Yehudit be-Artsot Ha-Berit. Ramat-Aviv, Tel-Aviv: ha-Universiṭah ha-petuḥah, 1988.
Liebman, Charles S. and Merkaz Argov. . Israel: Bar-Ilan University, Dept. of Political Studies, 2001.
Susser, Bernard and Charles S. Liebman. Choosing Survival : Strategies for a Jewish Future. New York: Oxford University Press, 1999.
Tabory, Mala and Charles S. Liebman. "Jewish International Activity : An Annotated Bibliography". Research Aids / Bar Ilan University, the Argov Center. Vol. 1. Ramat Gan: Bar Ilan University, The Argov Center, 1985.
