Michael Robert Milken is an American financier. He is known for his role in the development of the market for high-yield bonds, 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. With a net worth of US$6 billion as of 2022, he is among the richest people in the world.

In finance, a high-yield bond is a bond that is rated below investment grade by credit rating agencies. These bonds have a higher risk of default or other adverse credit events but offer higher yields than investment-grade bonds in order to compensate for the increased risk.