The American Theosophist and writer Geoffrey Avery Barborka (1897-1982) was a serious and deep student of H.P. Blavatsky's life, work and teachings. He conducted for many years classes on Madame Blavatsky's magnus opus The Secret Doctrine. Probably his most well-known books are The Divine Plan (an in depth commentary on The Secret Doctrine); H.P. Blavatsky, Tibet and Tulku; and The Mahatmas and Their Letters.  (Wikipedia)

• Theosophists