Martin Katahn, PhD (1928—2019), was professor of psychology emeritus at Vanderbilt University and director of the Vanderbilt University Weight Management Program. His #1 best-selling books include The Rotation Diet, The T-Factor Diet, and The Low-Fat Supermarket Shopper's Guide (with Jamie Pope).

Martin Katahn, PhD (1928—2019), was professor of psychology emeritus at Vanderbilt University and director of the Vanderbilt University Weight Management Program. His #1 best-selling books include The Rotation Diet, The T-Factor Diet, and The Low-Fat Supermarket Shopper's Guide (with Jamie Pope).

Martin Katahn, PhD (1928—2019), was professor of psychology emeritus at Vanderbilt University and director of the Vanderbilt University Weight Management Program. His #1 best-selling books include The Rotation Diet, The T-Factor Diet, and The Low-Fat Supermarket Shopper's Guide (with Jamie Pope).