author David Barr is a strength coach and scientist, with research specialty in nutrition and its impact on performance and body composition. Supplement Optimization is just one part of his upcoming work: The Anabolic Index: Optimized Nutrition and Performance Manual.

In addition to his work for NASA at the Johnson Space Center, David's research career has involved everything from the cellular basis of muscle breakdown to work on critically ill catabolic patients. He holds certifications with the NSCA as well as USA Track and Field.