Howard Stanley Marks (born 1946) is an American investor and writer. After working in senior positions at Citibank early in his career, Marks joined TCW in 1985 and created and led the High Yield, Convertible Securities and Distressed Debt groups. In 1995, he left TCW and co-founded Oaktree Capital Management. In the 2011 Forbes rankings of the wealthiest Americans, Marks was ranked the #273 richest in the United States, with a net worth of $1.5 billion.
He is known in the investment community for his "Oaktree memos" to clients which detail investment strategies and insight into the economy, and in 2011 he published the book The Most Important Thing: Uncommon Sense for the Thoughtful Investor.