pioneered

German chemist who with Kirchhoff pioneered spectrum analysis but is remembered mainly for his invention of the Bunsen burner (1811-1899)

United States comedian who pioneered comedy television shows (born 1922)

n conqueror of Gaul and master of Italy (100-44 BC) n United States comedian who pioneered comedy television shows (born 1922)

United States film maker who pioneered animated cartoons and created such characters as Mickey Mouse and Donald Duck

United States social reformer who pioneered in the reform of prisons and in the treatment of the mentally ill