Michael Robert Milken is an American financier. He is known for his role in the development of the market for high-yield bonds, which led to his reputation as the "Junk Bond King", and his conviction and sentence following a guilty plea on felony charges for violating U.S. securities laws. Milken's compensation while head of the high-yield bond department at Drexel Burnham Lambert in the late 1980s exceeded $1 billion over a four-year period, a record for U.S. income at that time.