Question: Where is the English mathematician who described Twistor Space in the 1960's the  Emeritus Rouse Ball Professor of Mathematics?
Context: Sir Roger Penrose {'1': ", '2': ", '3': ", '4': "} (born 8 August 1931) is an English mathematical physicist, mathematician and philosopher of science.  He is the Emeritus Rouse Ball Professor of Mathematics at the Mathematical Institute of the University of Oxford, as well as an Emeritus Fellow of Wadham College. Twistor string theory is an equivalence between N = 4 supersymmetric Yang–Mills theory and the perturbative topological B model string theory in twistor space. In differential geometry, the local twistor bundle is a specific vector bundle with connection that can be associated to any conformal manifold, at least locally.  Intuitively, a local twistor is an association of a twistor space to each point of space-time, together with a conformally invariant connection that relates the twistor spaces at different points.  This connection can have holonomy that obstructs the existence of "global" twistors (that is, solutions of the twistor equation in open sets). The Rouse Ball Professorship of Mathematics is one of the senior chairs in the Mathematics Departments at the University of Cambridge and the University of Oxford.  The two positions were founded in 1927 by a bequest from the mathematician W. W. Rouse Ball.  At Cambridge, this bequest was made with the "hope (but not making it in any way a condition) that it might be found practicable for such Professor or Reader to include in his or her lectures and treatment historical and philosophical aspects of the subject." In mathematics, twistor space is the complex vector space of solutions of the twistor equation formula_1.  It was described in the 1960s by Roger Penrose and Malcolm MacCallum.  According to Andrew Hodges, twistor space is useful for conceptualizing the way photons travel through space, using four complex numbers.  He also posits that twistor space may aid in understanding the asymmetry of the weak nuclear force. In mathematical physics, the Penrose transform, introduced by , is a complex analogue of the Radon transform that relates massless fields on spacetime to cohomology of sheaves on complex projective space.  The projective space in question is the twistor space, a geometrical space naturally associated to the original spacetime, and the twistor transform is also geometrically natural in the sense of integral geometry.  The Penrose transform is a major component of classical twistor theory. The Rouse Ball Professorship of English Law is one of the senior professorships in English Law at the University of Cambridge, and was founded in 1927 by a bequest from the mathematician Rouse Ball. Henry Arthur Hollond DSO OBE (1884-1974) was Rouse Ball Professor of English Law in the University of Cambridge from 1943 to 18 November 1950.  He is author of "English Legal Authors Before Blackstone", first published as a periodical article under the title "English Legal Authors Before 1700" at 9 Cambridge Law Journal 292, and then reprinted separately in 42 pages by Stevens & Sons Limited in 1947.  The work is "short but complete". Walter William Rouse Ball, known as W. W. Rouse Ball (14 August 1850 – 4 April 1925), was a British mathematician, lawyer, and fellow at Trinity College, Cambridge from 1878 to 1905.  He was also a keen amateur magician, and the founding president of the Cambridge Pentacle Club in 1919, one of the world's oldest magic societies. Glanville Llewelyn Williams QC, FBA (15 February 1911 – 10 April 1997) was a Welsh legal scholar who was the Rouse Ball Professor of English Law at the University of Cambridge from 1968 to 1978 and the Quain Professor of Jurisprudence at University College London from 1945 to 1955.  He has been described as Britain's foremost scholar of criminal law.
Answer: Mathematical Institute of the University of Oxford