AlterG, Inc. is an American medical device company founded in 2005 by Sean Whalen in Fremont, California. The company makes mobility enhancement products for physical therapy and athletic training. The first product, the Anti-Gravity Treadmill, now comes in three models, the F320, M320, and P200. In 2013 the company acquired Tibion Corporation and added the Bionic Leg to its list of products. Steve Basta is CEO. Sean Whalen and his father developed the original prototype of the Anti-Gravity Treadmill in the family garage. They used technology developed by NASA to create a treadmill that unweights a user through "differential air pressure." The Nike Oregon Project and legendary runner and coach Alberto Salazar as well as the Oakland Raiders and the Golden State Warriors tested and used the prototype. In 2007, the Washington Wizards were the first professional sports team to purchase the P200 model, and by 2008, the Miami Heat, Golden State Warriors, Chicago Bulls, Houston Rockets, Houston Texans, and Phoenix Suns all purchased the P200 for their training rooms. In 2008, the U.S. Food and Drug Administration (FDA) cleared the Anti-Gravity Treadmill, which at the time went by the name G-Trainer, as a medical device applicable for uses in rehabilitation. Since then the companys Anti-Gravity Treadmill has been used for rehabilitating lower extremity injury or surgery, aerobic conditioning, weight control, gait training for neurological conditions, strengthening and conditioning the elderly. The company named Steve Basta as CEO in 2011. Steve is a graduate of the Johns Hopkins Biomedical Engineering program. In 2013, AlterG acquired the Tibion Corporation, and took over production and sales of its flagship product, the Bionic Leg.