B ill Gross is an American investor and fund manager, famously known as the "Bond King" for his pioneering work in fixed-income investing. He co-founded Pacific Investment Management Company (PIMCO) in 1971 and built it into one of the largest and most influential asset management firms in the world. As the firm's chief investment officer, he managed the PIMCO Total Return fund, which became the world's largest bond fund under his leadership.

Gross's innovative strategies and his influential monthly investment outlooks made him one of the most powerful figures in global finance. His views could move markets, and he was renowned for his deep understanding of the bond market and macroeconomic trends. In 2014, he made a sudden and acrimonious departure from PIMCO to join Janus Henderson. He retired from fund management in 2019 to focus on managing his personal assets and his charitable foundation. He is also a world-renowned stamp collector.