Leo Burnett is an advertising agency that was founded in 1935 in Chicago, Illinois. The company provides advertising, marketing, and branding services to clients around the world. Leo Burnett has won numerous awards for its work, including Cannes Lions, Clios, and Effies. The company is known for its iconic advertising campaigns, such as the Marlboro Man and Tony the Tiger. Leo Burnett is part of the Publicis Groupe, a global advertising and communications company.