Joshua Rosenbaum is a finance professional and author best known for co-authoring the popular book "Investment Banking: Valuation, Leveraged Buyouts, and Mergers & Acquisitions." As of my knowledge cutoff in March 2023, Rosenbaum is a Managing Director at UBS Investment Bank, where he focuses on leveraged finance and financial sponsors. With a strong background in investment banking, Rosenbaum is well-regarded for his expertise in corporate finance and is often sought after for his insights into complex financial transactions. His book is widely used at business schools and in the finance industry as a practical guide to understanding and executing investment banking deals.