Inayat Khan Rehmat Khan (Urdu: عنایت خان رحمت خان; 5 July 1882 – 5 February 1927) was an Indian professor of musicology, singer, exponent of the saraswati vina, poet, philosopher, and pioneer of the transmission of Sufism to the West. At the urging of his students, and on the basis of his ancestral Sufi tradition and four-fold training and authorization at the hands of Sayyid Abu Hashim Madani (d. 1907) of Hyderabad, he established an order of Sufism (the Sufi Order) in London in 1914. By the time of his death in 1927, centers had been established throughout Europe and North America, and multiple volumes of his teachings had been published. Source: Wikipedia (en)