Mark Weber is an American Holocaust denier and the director of the Institute for Historical Review (IHR), a nonprofit organization known for publishing revisionist history materials that deny or minimize the Holocaust. Born in Portland, Oregon, Weber earned a B.A. in history with high honors from Portland State University after studying for two semesters at the University of Munich. He then obtained an M.A. in modern European history from Indiana University. Weber entered far-right activism in 1978 as news editor for National Vanguard, the publication of the neo-Nazi National Alliance founded by William Pierce. In 1980, he joined the staff of the Journal of Historical Review, published by the IHR, becoming its editor in 1988 and director of the IHR following the death of its founder, Willis Carto, in 2015 amid internal disputes. Under Weber's leadership, the IHR has organized conferences featuring Holocaust deniers and published works challenging mainstream historical accounts of World War II and the Holocaust. He has been widely criticized as an antisemite and pseudohistorian by organizations such as the Southern Poverty Law Center and the World Jewish Congress, which he has attacked. Weber has lectured internationally on revisionist topics and maintains that there was no German extermination policy against Jews, attributing deaths to disease and war conditions. His work is associated with white nationalist and far-right networks.