About the Author
Peter J. O'Brien is Professor emeritus at the Department of Pharmaceutical Sciences at the University of Toronto (Canada). He obtained his academic degrees from Birmingham University (UK) and took up his first independent scientific position at the Memorial University of Newfoundland in 1967. Since 1986 he has been a full Professor at Toronto. He has more than 300 publication to his name, and was awarded the prestigious McNeil-Janssen-Ortho award for his research in 1996.
William R. Bruce is Professor emeritus at the Departments of Medical Biophysics and Nutritional Sciences at the University of Toronto (Canada). He is a fellow of the Royal Society of Canada and a former director of the American Association for Cancer Research. In 1997 he received the H. O. Warwick Prize of the National Cancer Institute of Canada for his contributions to cancer prevention.