William 'Billy' Gibson was a boxing manager and promoter during the very early 1900s. In early 1914 he resigned as the promoter for Madison Square Garden, and its Garden A. C., and also severed his connections with the Fairmont Athletic Club of Harlem. In April he partnered with Maxey Blumenthal, former manager of Al Reich, to create the new Stadium Athletic Club, and signed a lease for St. Nicholas Arena, to present weekly Saturday night shows and two big mid-week shows each month, starting April 11, 1914. (He postponed that scheduled opening until he could get a license from the New York State Athletic Commission.) Sources: April 2, 1914 New York Times, p. 9; April 6, p. 10.
Per a wire report in the Tacoma News Tribune (Tacoma, WA, USA) upon his death at age 71, July 21, 1947 in New York, Gibson had also been a promoter at Havana, Cuba.