My research is in numerical optimisation. That is, I develop, analyse and implement algorithms for finding the maxima/minima of functions. I am particularly interested in settings where the function is computationally expensive to evaluate, or where only approximate values are available. This leads to the field of derivative-free optimisation.

Much of my code is available open source, and can be used by anyone (see my personal webpage for a list of available packages). I have also contributed code to the commercial NAG Library.