Dr. Mattes is a Distinguished Professor of Nutrition Science at Purdue University, Adjunct Associate Professor of Medicine at the Indiana University School of Medicine and Affiliated Scientist at the Monell Chemical Senses Center.  His research focuses on the areas of hunger and satiety, regulation of food intake in humans, food preferences, human cephalic phase responses and taste and smell.

At Purdue University, Dr. Mattes is the Director of the University Public Health Program and the Ingestive Behavior Research Center.  He also holds numerous external responsibilities including:  Vice President of American Society of Nutrition; Director of Public Health Graduate Program; Associate Editor of American Journal of Clinical Nutrition; and Director of Ingestive Behavior Research Center from Purdue University. He is also Secretary of the Rose Marie Pangborn Sensory Science Scholarship Fund.  He has received multiple awards, most recently the Babcock-Hart Award from the Institute of Food Technologists.  He has authored over 245 publications.

Dr. Mattes earned an undergraduate degree in biology and a Masters degree in Public Health from the University of Michigan as well as a doctorate degree in Human Nutrition from Cornell University.  He conducted post-doctoral studies at the Memorial Sloan-Kettering Cancer Center and the Monell Chemical Senses Center.