Leon MacLaren, born Leonardo da Vinci MacLaren (24 September 1910–24 June 1994), was a British philosopher and the founder of the School of Economic Science (SES). MacLaren was inspired by Henry George, Socrates, Dr Francis Roles, Pyotr Ouspensky, Maharishi Mahesh Yogi, and finally the philosophy of Advaita Vedānta through the Shankaracharyas of Jyoti Math.
MacLaren was born in Glasgow on 24 September 1910, but from the age of four grew up in the London suburb of Wimbledon. He was the son of Andrew MacLaren, a Labour Member of Parliament who was a staunch advocate of Henry George.
Maclaren said he was grateful to have inherited from his father three things: no religion, no education, and a strong desire to distrust experts.
At the age of sixteen, MacLaren contemplated how his life could best be put to the service of mankind, a one-word answer came to his mind, the word was "School". Describing the experience when he was siting by a lake in Wimbledon Park when he says:
It became very clear to me that there was such a thing as truth, and there was such a thing as justice, and that they could be found and, being found, could be taught. It seemed to me that that was the most valuable thing that one could pursue. So I resolved to pursue this when I was twenty-one.
MacLaren believed that the practical problems of the world could best be solved by transforming the nature of human beings.
MacLaren's influences include his father Andrew MacLaren, Shantanand Saraswati, Henry George, Georges Ivanovich Gurdjieff, P. D. Ouspensky, Francis Roles and Maharishi Mahesh Yogi. According to the Henry George Foundation, MacLaren joined the Henry George movement in London in 1931, serving on the executive committee from 1933 until 1937. At the 1936 International Conference of Georgist Organisations held in London, a contingent from the US presented a question-based method of teaching Henry George's ideas. MacLaren created a similar method and taught the course in London. In 1937 MacLaren left the Henry George movement and founded the School of Economic Science (SES) with the support of his father. In 1938 he was called to the bar and practised in Chambers at 2 Paper Buildings in the Inner Temple. In 1939 he was nominated to stand for Parliament against Winston Churchill, when war was declared the election was cancelled.
Some sources say MacLaren's father founded the school, while others state it was Leon. According to the SES web site, MacLaren introduced and developed philosophy courses to complement his economics courses. Over time the philosophy courses became SES's principal area of teaching. According to the group's literature, from the mid-1960s onwards, MacLaren presented, in addition to some of the ideas of P. D. Ouspensky, the philosophy of Advaita Vedanta, a philosophical theology of absolute non-duality as taught by the eighth-century Indian philosopher-theologian Śaṅkara.
He later stood as the Liberal candidate for Yeovil at the 1950 election and then at Hendon South in 1951 without any success. According to the SES web site, MacLaren studied Advaita Vedanta philosophy in 1965 with Shantanand Saraswati the Shankaracharya of Jyotir Math. MacLaren attended a lecture by Maharishi Mahesh Yogi at the Albert Hall in London in 1959 and became a student of the Maharishi. On commentator states that in the 1950s, MacLaren met and was deeply inspired by an Indian guru, Sri Shantanand Saraswati, and henceforth the School of Economic Sciences curriculum combined Platonic and Neoplatonic mysticism with Eastern Vedic philosophy. Meditation classes were taught alongside Socratic group dialogues.
According to Practical Philosophy's (founded by MacLaren) web site MacLaren spent three months in the early 1970s traveling around the world visiting the SES affiliated schools. MacLaren's illness came during his final world tour. He was brought back to England from South Africa and died in a London hospital on 24 June 1994. According to his foundation web site, MacLaren wrote a book called The Nature of Society. In 2009 MacLaren's former personal assistant, Dorine Tolley, published a biography of MacLaren's life called The Power Within: Leon MacLaren, A Memoir of His Life and Work.
In conjunction with Frances Roles, MacLaren founded the School of Meditation in London.
MacLaren was an enthusiast of the Sanskrit language, stating "The grammatical rules of Sanskrit are also the rules of creation". He began Sanskrit courses at School of Economic Science. Today SES represents the largest body of Sanskrit students in the UK.
MacLaren said on teamwork "The first quality of a leader of people – always the first quality – is a devotion to truth." and on praise "From praise comes joy, from joy – strength, from strength – virtue, from virtue – purity and from purity comes realization of one’s full potential." 
Leon MacLaren is described as one of three men responsible for meditation being practised so widely in the west due to his early adoption of the practice and propagation of it globally via the School of Economic Science, the other two men being Maharishi Mahesh Yogi and Dr Francis C. Roles of The Study Society .
He taught until the last week of his life. In 1994, though ill, he flew from London to South Africa to lead a study week with the School’s senior students. His visit was cut short when his health failed. He was flown back to London, where he died.
According to MacLaren's foundation web site he married twice, had two daughters and lived in Hammersmith and later Hampstead and Oxfordshire. MacLaren had two unsuccessful marriages, both with Study Society members. Neither woman ever joined the School of Economic Science, preferring to stay with Roles, even after MacLaren officially split from Roles and his group.
He had a keen interest in music, he played the saxophone in a jazz band in his early life and also played the piano. He also composed several pieces inducing: "In The Beginning", "Isha Upanishad" and "Rig Veda" , based on a seven tone scale described as the "natural octave", based on Gurdgieff and Ouspensky's teachings.
- Nature of Society (ISBN 9780956596819)
- Music: The Foundations of Harmony (ISBN 9780956596840)
- "Reminders": Extracts from the Lectures of Leon MacLaren (ISBN 9780956596802)
- The Science of Economics: The Economic Teaching of Leon MacLaren (ISBN 9780856832918)
- Brian Hodgkinson (2010). In Search of Truth. Shepheard-Walwyn (Publishers). ISBN 978-0-85683-276-5. pp. 2, 34, 48 and 59
- Petsche, Johanna J. M. (2015). "Gurdjieffian Overtones in Leon MacLaren's School of Economic Science". International Journal for the Study of New Religions. 6.2: 197–219
- MacLaren Foundation web site Archived 23 December 2013 at the Wayback Machine
- Dorine Tolley (2009). The Power Within: Leon MacLaren, A Memoir of His Life and Work. BookSurge Publishing. ISBN 1-4392-1030-6.
- Debenham, Nicholas (2014). Leon Maclaren - Memories and Tributes. London: School of Economic Science. p. 77.
- Adago, John (2018). East Meets West. London: Program Publishing. ISBN 978-0692124215.
- Encyclopedia of occultism & parapsychology. Melton, J. Gordon. (5th ed.). Detroit: Gale Group. 2001. ISBN 9780810385702. OCLC 45211020.CS1 maint: others (link)
- Land and Liberty, Henry George Foundation of Great Britain, 1933 p 231; 1935 p89; 1936 p94.
- Land and Liberty, Henry George Foundation of Great Britain, 1937 p97
- John Stewart (2001). Standing for Justice. Shepheard-Walwyn (Publishers). ISBN 978-0-85683194-2. p.65
- Henry George Foundation web site Archived 6 October 2010 at the Wayback Machine
- MacLaren, Leon, 1910-1994,. The science of economics : the economic teaching of Leon MacLaren. Makewell, Raymond,. Economic teaching of Leon MacLaren. ISBN 9780856832918. OCLC 827258190.CS1 maint: Multiple names: authors list (link)
- George D. Chryssides, Exploring New Religions, Continuum International Publishing (1999), page 374.
- George D. Chryssides, Exploring New Religions, Continuum International Publishing (1999), p.293.
- SES website
- British parliamentary election results, 1950-1973 by FWS Craig
- Mason, Paul (1994). The Maharishi—The Biography of the Man Who Gave Transcendental Meditation to the World. Shaftsbury, Dorset: Element Books Ltd. p. 28. ISBN 1-85230-571-1.
- Wellbeloved, Sophia (2003). Gurdjieff: Key Concepts. London and New York: Routledge. p. 250. ISBN 0-415-24897-3.
- Evans, Jules (2013). Philosophy for life and other dangerous situations. London: Rider. ISBN 9781846043215. OCLC 820781877.
- Unknown author Practical Philosophy web site accessed 4 February 2013
- "SCHOOL OF ECONOMIC SCIENCE (Religious Movement)". what-when-how.com. Retrieved 10 February 2019.
- Douglas, Paul (2010). Language and truth : a study of the Sanskrit language and its relationship with principles of truth. London: Shepheard-Walwyn. p. 2. ISBN 9780856833700. OCLC 704434256.
- Waite, Dennis (2014). Sanskrit for seekers. Winchester, UK; Washington, USA: Mantra Books. p. 12. ISBN 9781782792277. OCLC 870847091.
- Palmarossa, Paul. (2006). From principles to profit : the art of moral management. Rees, Chris, 1966-. London: Arcturus. ISBN 0572031920. OCLC 83756360.
- MacLaren, Leon. Music : the foundations of harmony (Revised ed.). London. ISBN 9780956596840. OCLC 874928840.
- Petsche, Johanna J.M. Gurdjieff and music : the Gurdjieff/de Hartmann piano music and its esoteric significance. Leiden. ISBN 9789004284425. OCLC 892055973.
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- MacLaren Foundation Official Web Site
- School of Economic Science Official Web Site
- Leon MacLaren and the origins of SES