Roger Lowenstein is an American financial journalist and author. He is best known for his books on Wall Street, including When Genius Failed: The Rise and Fall of Long-Term Capital Management and The End of Wall Street. Lowenstein has written for The Wall Street Journal, The New York Times, and Bloomberg. He is a contributing editor at Fortune magazine and a columnist for The New York Times Magazine. Lowenstein has also served as a consultant to the U.S. Treasury Department and the Federal Reserve Bank of New York. He is a graduate of Harvard College and the Harvard Business School. Lowenstein is a respected authority on the financial markets and has been featured in numerous television and radio interviews.