Israel Regardie

(1907–1985) — Crowley's secretary, later a chiropractor and lay psychotherapist, and the man who broke the seal for good.

Between 1937 and 1940 he published The Golden Dawn: the rituals, the grade papers, the Knowledge Lectures, the colour scales, the whole apparatus of an order sworn to secrecy, on the grounds that the material would otherwise die with the last surviving temples. He was denounced for it and he was probably right.

Almost everything this wing can show you exists in public because of this decision. A tradition that had been transmitted by oath became a book you could buy — which is the precise moment the Golden Dawn stopped being an order and became the default English-language Kabbalah.