Barbara E. Ainsworth is a Regents’ Professor in the Exercise Science and Health Promotion Program in School of Nutrition and Health Promotion at Arizona State University. Her research relates to physical activity and public health with focus on the assessment of physical activity in populations, the evaluation of physical activity questionnaires, and physical activity in women. Dr. Ainsworth is best known as the lead author for the Adult Compendium of Physical Activities, an exhaustive list of the energy cost of human physical activities. Dr. Ainsworth is a Past President of the American College of Sports Medicine (ACSM) and the National Academy of Kinesiology. She is a recipient of the ACSM Citation and Honor Awards and the SHAPE America McKenzie Award. In 2015 she received the Lifetime Achievement Award from the President’s Council on Fitness, Sports and Nutrition and has also has served on the President’s Council and the California Governor’s Council on Physical Fitness and Sport Scientific Committees. She is a life-long advocate of active living and spends her free time maintaining her yard and animals in Arizona, bicycling, and hiking in the nearby hills.