Better known by his initials, Bellur Krishnamachar Sundararaja Iyengar is one of the world’s best-known yoga gurus. As the New York Times wrote in a 2002 profile, “Perhaps no one has done more than Mr. Iyengar to bring yoga to the West.” In 2004, Time recognized his global influence, naming him one of the world’s most influential living people. His 1966 book Light on Yoga contains detailed instructions on how to perform more than 200 poses, according to Yoga Journal, and remains influential. That magazine has referred to Light on Yoga as the “Bible” of yoga.
For a glimpse of Iyengar in action, see the video below, filmed in 1977 (when he would have been around 58 years of age).