Philip David Welch (born 6 January 1954) is a British mathematician known for his contributions tologic andset theory. He is Professor of Pure Mathematics at the School of Mathematics,University of Bristol.^[1][2][3] He was the Coordinating Editor of theJournal of Symbolic Logic in 2016, President of theBritish Logic Colloquium from 2017 to 2022 and President of the European Set Theory Society from 2021 to 2025.

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Welch attendedLancing College. After obtaining a BSc in mathematics fromUniversity College London in 1975, he attendedExeter College at theUniversity of Oxford, taking an MSc in mathematical logic in 1976 and hisDPhil in 1979, under the supervision ofRobin Gandy. His dissertation was entitledCombinatorial Principles in the Core Model.

He worked as an assistant at the Seminar für Logik at theUniversity of Bonn from 1980 to 1981, then as an SERC Research Fellow atWolfson College, Oxford, from 1981 until 1983. Following a Royal Society European Research Fellowship at theUniversity of Bonn, and theFree University of Berlin (1984), he held a position as an assistant professor atUCLA 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 atKobe University, Japan. He subsequently held a Guest Professorship at the Kurt Gödel Research Center at theUniversity of Vienna (2000–2001) and a Mercator Professorship at the University of Bonn (2001) before returning to Bristol in 2002. He was appointed as a Professor there in 2004. Apart from research articles he is co-author with Aaron Beller andRonald JensenofCoding the Universe.^[4] In 2023, Welch was awarded a Senior Fellowship of the Zukunftskollegs at the University of Konstanz.^[5]

• Welch, Philip D with A. Beller, R.B. Jensen (1982).Coding the Universe. Cambridge University Press.ISBN 978-0-521-28040-2.{{cite book}}: CS1 maint: multiple names: authors list (link)
• Home page of Philip Welch at Bristol

• 1954 births
• Living people
• Alumni of University College London
• Alumni of Exeter College, Oxford
• 20th-century English mathematicians
• 21st-century English mathematicians
• Academics of the University of Bristol
• University of California, Los Angeles faculty
• 20th-century British philosophers
• 21st-century British philosophers

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• CS1 maint: multiple names: authors list