Robertson is one of the creators of the
MacTutor History of Mathematics archive, along with John J. O'Connor. Robertson has written more than 100 research articles, mainly on the theory of
groups and
semigroups. He is also the author or co-author of 17 textbooks. In 1998, he was elected a
Fellow of the Royal Society of Edinburgh. In 2015, he received together with his colleague O'Connor, the
Hirst Prize of the
London Mathematical Society for his work on the MacTutor History of Mathematics archive. His thesis on "Classes of Generalised Nilpotent Groups" was done with Stewart E. Stonehewer. ==Personal life==