Leo Burnett Worldwide is a global advertising agency founded in 1935 by Leo Burnett, an influential figure in the advertising industry. The agency is known for its creative approach and has developed iconic campaigns for major brands, including Marlboro, Pillsbury, and Tony the Tiger. With headquarters in Chicago, Leo Burnett Worldwide operates in numerous countries, providing services in advertising, digital marketing, and brand strategy. The agency emphasizes storytelling and emotional connections in its campaigns, aiming to create lasting impressions on consumers.