I am a mathematician. I teach at the School of Mathematics and Statistics. At the University of Sheffield. I have a teaching page. Some time ago, I was in the Department of Mathematics. At the University of Leicester. I obtained my PhD in 2010, after working with Neil Strickland. Before that, I did an undergraduate mathematics degree and the Certificate of Advanced Study. At Trinity College, Cambridge. I have the permanent general-purpose email address email@example.com.