B. K. S. Iyengar

Bellur Krishnamachar Sundararaja Iyengar was an Indian teacher of yoga and author. He is the founder of the style of yoga as exercise called "Iyengar Yoga", and was considered one of the foremost yoga gurus in the world. He was the author of many books on yoga practice and philosophy including Light on Yoga, Light on Pranayama, Light on the Yoga Sutras of Patanjali, and Light on Life. Iyengar was one of the earliest students of Tirumalai Krishnamacharya, who is often called "the father of modern yoga". He has been credited with popularizing yoga, first in India and then around the world.