Mr. Masayoshi Son is the Founder and serves as Chief Executive Officer and Chairman at SoftBank Group. He also serves as Chairman at SoftBank Mobile and on the Board of T-Mobile. He founded SoftBank Group Corp. in September 1981 and has been its Chairman and Chief Executive Officer from February 1986 until June 2015. Mr. Son serves in various capacities within SoftBank's portfolio of companies, including Vodafone (currently SoftBank Corp.) as its Chairman since 2015 and served as its Chairman and Chief Executive Officer from 2006 until 2015. In addition, Mr. Son sits on the board of directors of Yahoo! Japan Corporation, which was established as a joint venture between SoftBank and Yahoo! and served as its Chairman from 1996 until 2015. Mr. Son has also served as Honorary Chairman of the Broadband Association in Japan. He is also an Angel Investor. He also serves as Director at Yahoo Japan.