On August 20th, the world lost a man who in some way, influenced almost everyone who does yoga these days.
Here are the best articles I've found to get an idea of why:
Iyengar and the Invention of Yoga- The New Yorker
The Amazing Contortions of B.K.S. Iyengar- The Atlantic
B.K.S. Iyengar: The geruji who brought yoga to the masses - Aljazeera America
Death of a yoga giant.....- The Washington Post