A retired academic from the University of York, Geoff has researched the maintenance of genetic variation and speciation/hybridisation in spiders for over 50 years. He served as an ordinary member of Council between 2000 and 2003 and returned as Vice President in 2009. After a spell as President (2010-2013) he took on his present role as Hon. Secretary in 2014. He is one of the authors of Britain's Spiders, an editor of the Arachnologists' Handbook and, since 2020, an Honorary member of the Society.