Robert Francis Xavier Sillerman (born April 12, 1948) is an American businessman and media entrepreneur. Sillerman was the owner of a range of television and radio stations during the 1970s and 1980s, In 1993 he formed SFX Broadcasting, and then built SFX Entertainment—a concert and stage performance promoter that was sold to Clear Channel in 2000 for $4.4 billion. He refounded SFX Entertainment in 2012 as a promoter of electronic music festivals, and is also the founder of Viggle. He is also the namesake of The Sillerman Center for the Advancement of Philanthropy at Brandeis University. Once on the Forbes 400 list, he also briefly owned the WLAF's New York/New Jersey Knights.