Leo Burnett | 711,872 followers on LinkedIn. Leo Burnett is a communications agency powered by its HumanKind operating system, with the belief that creativity, data and technology work together to transform human behavior and drive prosperity for clients. Part of Publicis Communications, Leo Burnett Worldwide is one of the world's largest agency networks with 85 offices and more than 8,000 employees. The global agency works with some of the world's most valued brands including Aldi, Bank of America, Campbell's, Dunkin, Firestone, Jim Beam, Kellogg's, Nintendo, Tillamook and UnitedHealthcare among others.