Bill Gross is a prominent American investor and fund manager, widely recognized as the co-founder of Pacific Investment Management Company (PIMCO). He played a pivotal role in building PIMCO into one of the world's largest fixed-income investment firms, managing the Total Return Fund, which became the largest bond fund globally. Known as the 'Bond King', Gross has been influential in shaping modern bond portfolio management and has authored numerous investment outlooks and market commentaries.