Grobman grew up in Camden, New Jersey, the son of a pharmacist and a synagogue secretary. He earned his PhD at the Hebrew University of Jerusalem.
Grobman's book Denying Histoy," has been described as serving to "remind us the past is not entirely negotiable," that, "Good historians can uncover and explain the past with provisional certainty - if they account for personal and cultural bias, and that it can be established beyong any reasonable doubt that the holocaust was real.
Grobman has writte three books dealing with the issue of scholarly work that denies reality, Denying History, nations United, and the Palestinian Right to Israel. In Denying History, co-authors Michael Shermer and Grobman note that "Sociologists are aware of the problem of a researcher's 'co-option' by a group–a cult or New Age religion, perhaps– whereby the scholar, in entering a group and spending considerable time with its members, publishes a paper or book that is not as objective as he or she may believe." They cite the work of sociologists Stephen Kent and Theresa Krebs who have identified "numerous cases of 'when scholars know sin,' where allegedly nonpartisan, unbiased scholars find themselves the unwitting tools of religious groups striving for social acceptance and in need of the imprimatur of an academic."
According to CNN ". . . Shermer and Grobman do more than just refute ridiculous allegations. They also use the example of Holocaust denial literature to examine free speech issues, the psychology of right-wing extremists, and the role of biases in historical research."