Lebowitz joined HBK in 1992 and became a partner in 1994. HBK is a global multi-strategy investment firm that invests across a broad range of public and private equity, corporate debt, sovereign debt, quantitative, and derivative strategies with a particular focus on risk management and preservation of capital. Lebowitz managed HBK's worldwide equities businesses for more than six years and served on the firm's Investment Committee and Management Committee until his retirement from HBK at the end of 2009. He served as HBK's Chairman from late 2007 through 2009. Prior to HBK, Lebowitz was employed by Bass Brothers Enterprises and ESL Partners in various portfolio management roles. Lebowitz holds an undergraduate degree from Harvard College in Engineering and Applied Sciences, with a specialization in Computer Science, and a Master's degree in Business Administration from Harvard Business School.