B.K.S. Iyengar was a yoga teacher whose method transformed the practice of yoga in the United States and around the world. Emphasizing precision, alignment, and the therapeutic benefits of postures, he introduced millions of Americans to yoga as a discipline for physical and mental wellbeing. His influential book Light on Yoga became a foundational text for practitioners worldwide, while the Iyengar method shaped generations of teachers and helped establish yoga as a mainstream component of American health and wellness.