Feild was born in Hascombe, Surrey, England, the son of Violet Esmé „Mouse” (Bentley) and Armstead Littlejohn Feild. As a young, upper-class Englishman, Feild was educated at Eton and served in the Royal Navy, where he had an undistinguished career. In the early 1960s, Feild formed a folk duo, the Kensington Squares, with Dion O’Brien, later known as Tom Springfield. When the duo added Dion’s sister Mary, they became the Springfields, with Mary becoming known as Dusty Springfield. The trio had minor pop hits in Britain before Feild left in late 1962; he was replaced by Mike Hurst.
Feild was influenced by the spiritual teachings of G. I. Gurdjieff, P. D. Ouspensky, and others. He studied spiritual healing, and was involved with the Alice Bailey community. In the late 1960s, he was initiated as a sheikh in the Sufi Order International by Pir Vilayat Inayat Khan. Feild studied with Bulent Rauf, a Turkish author and translator descended from a line of Sufi masters going back to the Andalusian mystic Muhyiddin Ibn Arabi (1165–1240). He established the Beshara Centre at Swyre Farm in Aldsworth, England, in 1970. A description of events at this center is given in the books I, Wabenzi by Rafi Zabor, and Beshara and Ibn ‘Arabi: A Movement of Sufi Spirituality in the Modern World.
In December 1971, he and a group of students went to Konya, Turkey, to meet Bulent and the sema of the Mevlevi order of Dervishes. While there, he met Sheikh Suleiman (Süleyman) Dede. In 1972 Feild resigned his role in the Sufi Order. In 1973, he resigned his role leading the Beshara Centre  and went to Los Angeles, Tepoztlan, Mexico, and Vancouver Island, BC, where he taught on his own.
In 1976, he was made a sheikh in the Mevlevi order by Suleiman Dede. It should be noted that this was a revolutionary move, as a Dede of the Mevlevi Order had never bestowed the title of a Sheikh before – Only a Chelebi Efendi, the head of the Mevlevi Order, could bestow such a title. In light of this, Field’s presence as a Mevlevi Sheikh would not have been achnowledged by the central governing of the Mevlevi Order, and could be best viewed as a transformatory off-shoot of the Order.
After receiving the rank of Sheikh, Reshad Field moved to Boulder, Colorado, where he started a small centre. In Boulder Reshad assisted in introducing the sema ceremony – which was declared a cultural world heritage activity by UNESCO in 2004 – to America and Europe, and made it available to women for the first time in recent history, as well as non-Muslim participants (i.e. students).
Later, Feild taught on the essence of the universality of Sufi teachings, making them available to people of all religious and spiritual backgrounds. He published more than a dozen books, some of which have been translated into many languages.
In his autobiographical novel The Last Barrier, he gave a fictionalized account of how he met Bulent Rauf.