Henry John Sinclair, 2nd Baron Pentland was the President of the Gurdjieff Foundation of New York from its formation in 1953 and the President of the Gurdjieff Foundation of California from its inception in 1955. He held both posts until his death. He also helped ensure the publication of English editions of Gurdjieff's and Ouspensky's books and worked to found Gurdjieff centers throughout North America.