Leon Black, Chairman, CEO and Director, Apollo Global Management, LLC, speaks at the Milken Institute's 21st Global Conference in Beverly Hills, California, U.S. May 1, 2018. REUTERS/Lucy Nicholson WASHINGTON - Billionaire investor Leon Black told a U.S. congressional panel on Friday that he had no involvement or knowledge of the late convicted sex offender Jeffrey Epstein's "heinous conduct." "Let me state unequivocally that I have never abused a woman.