Mendoza served as Chairman of the WBA Ratings Committee from October 1978 to 1979. During this time, he led the committee in writing the Norms and Procedures for Ratings, which established rules for the sport. This manual became known as "Mendoza's Manual for Ratings" in recognition. Shortly before his death, then-WBA President Rodrigo Sanchez nominated Mendoza for the position when it became clear to Sanchez that he would not be able to continue his duties. Sanchez died in 1982, and Mendoza was elected President over deputy commissioner of the New Jersey Athletic Commission, Bob Lee, in a 41 to 32 vote. During his time as WBA President, Mendoza created KO Drugs, a
substance abuse program aimed at helping young people find a better future via boxing. In March 2022, KO Drugs had its 37th edition festival in
Panama City. In December 2015, Gilberto Mendoza Sr. stepped down as President due to his health. In a unanimous decision, WBA delegates agreed that Mendoza Sr. would be succeeded by his son,
Gilberto Mendoza Jr., then Vice-President of the WBA. Mendoza Jr. had already taken on many of the President's duties. In another unanimous vote, Mendoza Sr. was named WBA President Emeritus. ==Death==