Richard Freeman was a disciple of B. K. S. Iyengar and Pattabhi Jois. An expert of the tradition, he has taught Ashtanga Vinyasa Yoga for many decades. He is the co-founder of the Yoga Workshop of Boulder and author of El espejo del yoga. Mary Taylor was a disciple of Pattabhi Jois and has taught Ashtanga Vinyasa Yoga for decades. She is the co-founder of the Yoga Workshop of Boulder and author of What Are You Hungry For?