B.K.S. Iyengar, of Pune, India, is a living yoga master and author of several authoritative books on the subject of yoga, including Light on Yoga (a comprehensive presentation of yoga asanas), Light on Pranayama (dealing with yoga philosophy and breathing practice), and Light on the Yoga Sutras of Patanjali. Mr. Iyengar's precise method of teaching hatha yoga has been transmitted to teachers all over the world. For a listing of certified Iyengar yoga teachers in the United States, visit the B.K.S. Iyengar Yoga National Association of the U.S. web site.