Gerald Tsai Jr. (Chinese: 蔡至勇; pinyin: Cài Zhìyǒng; March 10, 1929 – July 9, 2008) was a billionaire investor and philanthropist who helped build Fidelity Investments into a mutual fund powerhouse.Tsai pioneered the use of performance funds in money management during the 1950s and 1960s. After starting Fidelity Investments' first publicly sold aggressive growth fund in 1958, the Fidelity Capital Fund, he later founded the Manhattan Fund, an aggressive growth fund, in 1965.