Alcoholics Anonymous founded by Bill W.
History
AA was founded on 10 June 1935 but AA's origins are said to have begun when the renowned psychotherapist Carl Jung inspired Rowland H., an otherwise hopeless drunk, to seek a spiritual solution by sending him to the Oxford Group— a non-denominational, altruistic Christian movement modeled after first-century Christianity. Ebby Thacher got sober in that same Oxford Group and reached out to help his drinking buddy Bill Wilson. Thacher approached Wilson saying that he had "got religion", was sober, and that Wilson could do the same if he set aside objections and instead formed a personal idea of God, "another power" or "higher power". Feeling a "kinship of common suffering", Wilson attended his first group gathering, although he was drunk.  Within days, Wilson admitted himself to the Charles B. Towns Hospital after drinking four beers on the way—the last alcohol he ever drank. Under the care of Dr. William Duncan Silkworth (an early benefactor of AA), Wilson's detox included the deliriant belladonna. At the hospital, a despairing Wilson experienced a bright flash of light, which he felt to be God revealing himself.Following his hospital discharge, Wilson joined the Oxford Group and tried to recruit other alcoholics to the group.  These early efforts to help others kept him sober, but were ineffective in getting  anyone else to join the group and get sober.  Dr. Silkworth suggested that Wilson place less stress on religion (as required by The Oxford Group) and more on the science of treating alcoholism. 
Wilson's first success came during a business trip to Akron, Ohio, where he was introduced to Robert Smith, a surgeon and Oxford Group member who was unable to stay sober. After thirty days of working with Wilson, Smith drank his last drink on 10 June 1935, the date marked by AA for its anniversaries.The first female member, Florence Rankin, joined AA in March 1937, and the first non-Protestant member, a Roman Catholic, joined in 1939. The first Black AA group was established in 1945 in Washington, D.C. by Jim S., an African-American physician from Virginia.While writing the Big Book in the several years after 1935, Wilson developed the Twelve Steps, which were influenced by the Oxford Group's 6 steps and various readings, including William James's The Varieties of Religious Experience.