During the 1960s he founded an organization called Any Boy Can, which taught boxing to underprivileged youth in the San Diego area. In 1974 he helped train heavyweight boxer George Foreman for his famous "Rumble in the Jungle" title bout in Zaire against Muhammad Ali. In 1976 he served as an assistant coach for the Nigerian Olympic boxing team. Actively involved in efforts to teach children about the dangers of drug abuse, he worked during the 1980s as a youth boxing instructor for the federal Department of Housing and Urban Development, assigned largely to ghettos in San Diego and Los Angeles. "I try to pass on the arts I know: self-control, self-reliance, self-defense," he told a reporter. In the early 1990s he again worked as a trainer for George Foreman.