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Click here for slides from some of my talks.
From 1998 to 2020 I was an editor of Algebra
I was UK co-ordinator of the EC ALFA project
I was co-chair of the programme committee of
Advances in Modal Logic 2006.
I was on the steering committee of AiML
from 2006 to 2012, and was a PC member of Advances in Modal Logic
I was on the programme committee of TIME'05,
I do extensive refereeing for journals and conferences.
I have visited Rob Goldblatt at Victoria University of Wellington
in 2003, 2004, 2007, 2010, 2011-12, and 2014. He visited me in London in 2009.
I visited Departamento de Matematica, Universidade de Aveiro, Portugal, in April 2012,
as well as several times in the 1990s.