Although appearing in a detective fiction magazine, the Green Lama tales can be considered science fiction or supernatural fantasy in that the Green Lama and other characters are possessed of superhuman powers and super-science weapons.

The Green Lama is an alias of Jethro Dumont, a rich resident of New York City, born July 25, 1913, to millionaires John Pierre Dumont and Janet Lansing. He received his A.B. from Harvard University, M.A. from Oxford, and Ph.D. from the Sorbonne; he also attended Drepung College in Tibet.

He inherited his father’s fortune, estimated at ten million dollars, when his parents were both killed in an accident while he was still at Harvard; he then spent ten years in Tibet studying to be a lama (a Buddhist Spiritual Teacher), acquiring many mystical powers in the process. He returned to America intending to spread the doctrines of Tibetan Buddhism (to relieve suffering by removing ignorance), but realized that he could accomplish more by fighting crime, since Americans were not ready to receive spiritual teachings.

He never carried a gun, believing that "this would make me no better than those I fight". Dumont was also endowed with superhuman powers acquired through his scientific knowledge of radioactive salts. Dumont had two main alter egos: the crime-fighting Green Lama and the Buddhist priest Dr. Pali. Additional alter egos included the adventurer "Hugh Gilmore".

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