Donald taught courses in communications, advertising, marketing and promotion at four major universities during his academic career. At the universities of Kansas and Nebraska, he taught in Schools of Journalism. At the University of Denver and Metropolitan State University of Denver, he taught in the Department of Marketing. His research work centered on business-to-business marketing with an emphasis on distribution and promotion. He also did some research on ethics in business-to-business marketing and the lack of emphasis on developing character in salespeople.
During his academic career, Donald consulted for several companies and industry organizations. For example, he developed research programs and promotional materials for the livestock feedlot association in Nebraska, and developed a marketing program and coursework for the sign industry in the State of Colorado.