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Philip David Welch (born 1954 in Newport, Hampshire) is a British mathematician known for his contributions to logic and set theory. Previously an Assistant Professor in Mathematics at the University of California, Los Angeles,  he moved to the School of Mathematics, University of Bristol   where he is now   Professor of Pure Mathematics. He is currently President of the British Logic Colloquium (2017), Vice-President of the European Set Theory Society (2018), and the Coordinating Editor of the Journal of Symbolic Logic (2016).

Biography
He attended Lancing College and after obtaining a BSc in mathematics from University College London in 1975, he attended Exeter College at the University of Oxford taking an MSc in mathematical logic in 1976, and his DPhil in 1979,  under the supervision of Robin Gandy with a dissertation entitled ''Combinatorial Principles in the Core Model’’.

He worked as an assistant at the Seminar für Logik at the University of Bonn from 1980 to 1981, then as an SERC Research Fellow at Wolfson College, Oxford from 1981 until 1983. Following a Royal Society European Research Fellowship at the University of Bonn, and the Free University of Berlin (1984) he held a position as an Assistant Professor at UCLA until 1986. In 1997 he left Bristol in order to set up a research group in set theory at the Graduate School of Science and Technology at Kobe University, Japan. He subsequently held a Guest Professorship at the Kurt Gödel Research Center at the University of Vienna (2000-2001) and a Mercator Professorship at the University of Bonn (2001) before returning to Bristol in 2002. He was appointed there as a Professor in 2004. Apart from research articles he is co-author with Aaron Beller and Ronald Jensen of Coding the Universe.