ALAN SEELENFREUND is retired chairman of McKesson Corporation, a health care supply management company. He served McKesson as chairman and chief executive officer from 1989 to 2002, and was chief financial officer before that. Prior to joining McKesson, he was on the faculty of the Graduate School of Business of Stanford University, where he authored a number of research reports and lectured on business economics and financial analysis. Seelenfreund is a director of The Nature Conservancy of California. He received a bachelor’s degree in mechanical engineering and a master’s degree in industrial engineering from Cornell University, and a doctorate in management science from Stanford University.