Master Djwhal Khul (also written as Master Djwal Khul, or Master DK, or simply The Tibetan) is an advanced initiate on the same spiritual Path as all aspirants and disciples. Among his many spiritual projects, he is best known as the Master who dictated to Alice Bailey an expansion and updating of the Ageless Wisdom teachings, covering a wide variety of themes from esoteric psychology to esoteric healing, from cosmic evolution to the consciousness of the atom. Between 1919 and 1949, he and Alice Bailey produced a large corpus of esoteric literature, known as the Blue Books. Master DK was also responsible for the content of the Alice Bailey talks presented during the 1940s to students at the Arcane School.

His own description of himself is as follows:

I am a brother of yours, who has travelled a little longer upon the Path than has the average student, and has therefore incurred greater responsibilities. I am one who has wrestled and fought his way into a greater measure of light than has the aspirant who will read this article, and I must therefore act as a transmitter of the light, no matter what the cost… My work is to teach and spread the knowledge of the Ageless Wisdom wherever I can find a response, and I have been doing this for many years…The books that I have written are sent out with no claim for their acceptance. They may, or may not, be correct, true and useful. It is for you to ascertain their truth by right practice and by the exercise of the intuition. ..If they present truth in such a way that it follows sequentially upon that already offered in the world teachings, if the information given raises the aspiration and the will-to-serve from the plane of the emotions to that of the mind (the plane whereon the Masters can be found) then they will have served their purpose. If the teaching conveyed calls forth a response from the illumined mind of the worker in the world, and brings a flashing forth of his intuition, then let that teaching be accepted. But not otherwise.