He is a specialist in international criminal law, the Holocaust, the history of the Romani people in Eastern Europe and Russia, and 20th century China.
He has served as an expert witness in court cases in the United States and Canada, and testified before the U.S. Congress’ Commission on Security and Cooperation in Europe and the New York City Council’s Committee on Immigration.
The following year he joined a special team of archivists in the Department of Defense that worked with the U.S. Senate's Church Committee investigation of the U.S. intelligence community.
[3] Over the past 20 years, he has served as an expert witness in the United States, Canada, and Israel on cases dealing principally with asylum and extradition issues.
[4] Over the years, Crowe has been the recipient or co-recipient of grants from the American Council of Learned Societies, the U.S. Department of Education, the Rockefeller Foundation, the National Endowment for the Humanities .
The Washington Post called Crowe’s principal book on the Roma, A History of the Gypsies of Eastern Europe and Russia (1998), “the most comprehensive and indispensable of its kind in English.”[9] Ian Hancock said it was “remarkably thorough and compassionate,”[10] while a reviewer in Ethnic and Racial Studies wrote that it was a “clearly first rate” study that was “impeccably researched, extremely informational and well written.