Ringling Bros, originally acquired by his father Irvin for $8 million, was later sold by Irvin and his brother Ken for $50 million. However, they bought it back once again for an estimated $23 million. While Ken was the one to fill in their father’s shoes after he died from a heart attack in 1984, Feld still serves as chairman and CEO of the empire that that puts on some 5,000 shows annually for 30 million people worldwide.