During his tenure in advertising at DMB&B, Ogilvy & Mather, and Young & Rubicam, Jonas worked for a diverse variety of clients, developing expertise in advertising and branding as well as in public relations, promotions, direct marketing, corporate identity and package design, and multinational communications. As an account manager, Jonas applied his knowledge to a variety of blue-chip clients, including General Foods, Merrill Lynch, Kodak, and AT&T. While at Y&R, he became director of globalization, helping clients to integrate marketing communications worldwide. Since joining Greenfield in 1991, Jonas has played a key role in the growth of the company, conducting thousands of focus groups and interviews for a diverse group of clients. He received his bachelor's degree from the University of Pennsylvania, subsequently obtaining an M.A. in English and an M.B.A.