Hello ladies and gentelmen. I am currently studying mathematics in middle-east, I want to study Twistor Theory in master. the problem is most of twistor specialists in UK(including Roger Penrose) and my scholarship allow me to choose only university in USA . I did quick search here are professors or schools that I found interested in twistor: UK: Oxford University (the only university that has group on twistor http://www.maths.ox.ac.uk/groups/mathematical-physics/research-areas/twistor-theory) 2-Dr Maciej Dunajski University of Cambridge Theoretical High Energy Particle Physics Group(Centre for Mathematical Sciences) 3-Stephen Huggett, Reader in Mathematical Physics, University of Plymouth -Christian Saemann Department of Mathematics, Heriot-Watt University 4-Bill Spence, current: Head of School of Physics and Astronomy, Queen Mary, University of London 5-Gabriele Travaglini School of Physics and Astronomy Queen Mary, University of London 5-Mr Moritz F. Högner, Moritz is a member of the Department of Applied Mathematics and Theoretical Physics High Energy Physics research group. His current research interests are self-duality, twistor theory and integrability. USA: Edward Witten(who combined twistor and string theory) : But seems near to impossible to be your advisor ("www.princeton.edu/physics/graduate-program/theses/theses-from-2005/P.Svrcekthesis.pdf" [Broken]) So, Which school do you suggest to study twistor in usa?