Dr. James Stoppani, Jr. (13 January 1968) is a kinesiologist; bodybuilder; author; health, fitness, and nutrition expert and consultant; and Founder of JYM Supplement Science, his own eponymous line of nutritional supplements. Stoppani is also a contributor to Muscle & Fitness and Bodybuilding.com.

Stoppani grew up in Torrington, Connecticut, and began bodybuilding as a teenager, for which he won several regional awards.

Stoppani earned a Bachelor of Science degree in Athletic Training from the University of Connecticut in 1990, followed by a Master of Science degree in Exercise Science from Georgia Southern University in 1993. Stoppani returned to UConn to pursue a doctorate in Exercise Physiology, which he completed in 2000.

From 2000 to 2002 Stoppani worked as a postdoctoral researcher in the John B. Pierce Laboratory at the Yale University School of Medicine, where his research into the effects of nutrition and exercise on gene regulation in muscle tissue earned him the Gatorade Beginning Investigator in Exercise Science Award from the American Physiological Society in 2002.

During his time at Yale, Stoppani wrote articles and sent them to renowned bodybuilder and fitness publisher Joe Weider, who then hired Stoppani away from academia to serve as Senior Science Editor at Weider Publications, whose titles included Muscle & Fitness , Men's Fitness , and SHAPE. Some years following Weider Publications'acquisition by American Media, Inc., Stoppani felt alienated by the new corporate culture and decided to strike out independently.

Stoppani has written thousands of articles on health, exercise, and nutrition, and runs his own website, JimStoppani.com, where subscribers can access hundreds of customized exercise and diet plans. Stoppani maintains a very active and robust presence across the major social media platforms, and is known for answering all his followers' questions. Stoppani has also worked with celebrity clients including Dr. Dre, LL Cool J, Dwayne "The Rock" Johnson, and Mario Lopez, and has appeared on television programs including NBC's Extra and Spike's Jesse James Is a Dead Man and Manswers .

Stoppani created his own line of nutritional supplements, JYM Supplement Science, that contain his own custom, proprietary macronutrient and micronutrient formulations. JYM Supplement Science products are currently sold at Bodybuilding.com, GNC, and Amazon.