He is Senior Lecturer in Mathematics at the University of Bath (where he works in group theory) and current professor in residence at Wells Cathedral School.

[1] Smith was the leader of the United Kingdom team at the International Mathematical Olympiad between 2002 and 2010, a longer continuous period than any other person.

[3] Smith oversaw a quantitative increase in training: annual events in Bath (moving to The Queen's College, Oxford, from 2009), at Oundle School, in Hungary, at Trinity College, Cambridge, and immediately prior to the IMO itself.

He often collaborates with Christopher Bradley and David Monk, and has published several papers on Forum Geometricorum, the online geometry journal.

[9] In June 2011, Smith was awarded an MBE for services to education following his contributions toward organising Royal Institution Maths Masterclasses.