There are many organisations offering teachings on Yoga philosophy and techniques.
In 1920, the Self Realization Fellowship (SRF) was founded by Paramahansa Yogananda in the USA.
Paramhansa Yogananda wrote the book "An autobiography of a Yogi". The SRF provides bi-weekly lessons via mail that promote meditation techniques, such as Kriya Yoga, to a western audience.
Life Foundation is a organisation who aim to bring light into the world through Dru Yoga, meditation and many other courses. They are responsible for bringing together the world peace flame, which burns continuously at their base near Bethesda in North Wales.
The Comprehensive Yoga Fellowship (CYF) exists in order to make known to its members, the ideas and philosophy of some of the greatest Yoga Teachers in the world, and provide a teaching and expertise that will equip its graduate teachers with the right background and teaching, so that they may become among some of the best in the field of Yoga.