Former neo-Nazi Pawel-Pinchas Bromson spoke to more than 500 students as he conducted his first tour of Britain.
Mr Bromson, from Warsaw, visited campuses to tell the dramatic story of how he was a radical hater of foreigners, including Jews and Arabs, until he discovered that he and his wife were Jewish. The tour was organised by Chabad.
Mr Bromson explained how he made the discovery in a stack of papers he found in Warsaw Museum.
Later he plucked up the courage to visit the city's synagogue and was helped to embrace Orthodox Judaism and an observant lifestyle.