b. k. s. iyengar, or bellur krishnamachar sundararaja iyengar (december 14, 1918 - august 20, 2014) was an indian yoga teacher and writer. he founded the style of yoga known as "iyengar yoga". and it was an honour by him to invent a new yoga style after ages. he was thought to be one of the foremost yoga teachers in the world.