Day obtained a bachelor's degree from the University of British Columbia and an MBA from the University of Western Ontario. He received a PhD degree from Columbia University in 1968.
He previously taught at Stanford University, IMD (International Management Development Institute) in Lausanne, Switzerland, and the University of Toronto, and has held visiting appointments at MIT, the Harvard BUSINESS School, the London Business School and the Indian School of Business. Prior to joining the Wharton School, he was Executive Director of the Marketing Science Institute, an industry-supported research consortium.
He has been a consultant to numerous corporations such as AT&T, Eastman Kodak, General Electric, IBM, U.S. West, Metropolitan Life, Marriott, WHIRLPOOL Corporation, Molson Companies, Unilever, E.I. DuPont de Nemours, W. L. Gore and Associates, Boeing, LG Corp., Merck, Johnson & Johnson and Medtronic. He is past chairman of the American Marketing Association, a director of the Biosciences Research and Education Foundation, the Lower Merion Conservancy and the Free Library of Philadelphia.
He serves on three editorial boards and has authored eighteen BOOKS in the areas of marketing and strategic management. He has directed and participated in senior management programs in 20 countries, including the United States, Canada, Europe, Japan, Singapore, South Africa, India, Latin America, Mexico, Australia and New Zealand.
He has RECEIVED awards including two Alpha Kappa Psi Foundation Awards and two Harold H. Maynard Awards for the best articles published in the Journal of Marketing. In 2003 he received the Sheth Foundation Journal of Marketing Award for articles making long-run contributions to the field of marketing. In 1994, he received the Charles Coolidge Parlin Award, which each year honors an outstanding leader in the field of marketing, and in 1996 he received the Paul D. Converse Award for outstanding contributions to the development of the science of marketing. He was selected as the outstanding marketing educator for 1999 by the Academy of Marketing Science. In 2001 he received the Mahajan Award for career contributions to marketing strategy by the American Marketing Association, and in 2003 he received the AMA/Irwin/McGraw-Hill Distinguished Marketing Educator award. INFORMS determined that two of his articles were among the top 25 most influential articles in marketing science in the past 25 years. In 2011 he was selected as one of eleven "Legends in Marketing."