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Key Speakers At The 20th Annual Sohn Investment Conference

William "Bill" Ackman, founder and chief executive officer of Pershing Square Capital Management LP, speaks during the 20th Annual Sohn Investment Conference in New York, U.S., on Monday, May 4, 2015. Since 1996 the Sohn Investment Conference has brought together the world's savviest investors to share fresh insights and strategies in support of pediatric cancer research and treatment. Photographer: Andrew Harrer/Bloomberg via Getty Images

William “Bill” Ackman, founder and chief executive officer of Pershing Square Capital Management LP, speaks during the 20th Annual Sohn Investment Conference in New York, U.S., on Monday, May 4, 2015. Since 1996 the Sohn Investment Conference has brought together the world’s savviest investors to share fresh insights and strategies in support of pediatric cancer research and treatment. Photographer: Andrew Harrer/Bloomberg via Getty Images