Ananda Yoga was established by
Swami Kriyananda taking from one of the oldest Hatha Yoga systems in the West. Its roots are the 1940s/1950s, when Kriyananda was taught these postures by
Paramhansa Yogananda.
Yogananda, asked Swamiji (then J. Donald Walters) and other young monks, to demonstrate the postures for visiting guests, as well as for public events, such as the SRF "Lake Shrine Dedication." Kriyananda and other monks also posed for photos, for articles on the yoga postures in Yogananda's magazine.
From 1965, Swamiji started to teach Ananda Yoga publicly in California. The director of Ananda Yoga today, Gyandev Rich McCord, is a co-founder of
Yoga Alliance and a member of its board of directors.
You can study these postures in Swami Kriyananda's book,
The Art & Science of Raja Yoga, or through Nayaswami Gyandev's book,
Spiritual Yoga.