Joined Salomon Brothers in 1987, moved to Goldman Sachs in 1990, and became a partner at the age of 30 in 1994. In 1999, co-founded Monex, Inc. in partnership with Sony, and established Monex Group, Inc. in 2004. Monex Group operates a wide range of businesses, including Monex Securities and TradeStation Securities, which are retail online brokerage firms in Japan and the U.S., as well as Japan Catalyst, which specializes in engagement asset management. Additionally, the group provides Web3 support services, full-genome-related services, and human resource development businesses. Monex Group also has Coincheck Group, listed on the NASDAQ in the U.S., as a subsidiary, under which Coincheck, one of Japan's largest digital asset exchanges, operates. Served as an external board member of the Tokyo Stock Exchange for five years and participated in government committees related to governance reform, actively contributing to the improvement and reform of Japan’s capital markets. An outside director of Mastercard in the U.S. and a former Vice Chair of Human Rights Watch.