I held positions at the University of New South Wales and the University of Melbourne before coming to Bath in 1985. I have held the position of Professor of Numerical Analysis at Bath since May 2000.

I have had substantial research collaborations in USA, Germany, Australia and Switzerland and visiting positions at University of Iowa, University of Kiel, University of New South Wales, Max-Planck Institute Leipzig, California Institute of Technology, Radon Institute Austria, University of Zuerich and the Chinese University of Hong Kong.

Most of my research concerns various  aspects of the numerical analysis of partial differential equations. Applications in which I am currently working include: fluid flow in uncertain media, seismic imaging of the earth's subsurface and the analysis of the safety of reactors.

My research is currently supported by Schlumberger Gould Research and by Amec Foster Wheeler plc.

Recent invited plenary talks include the 9th ENUMath Conference (Leicester 2011), the 11th International Conference on Mathematical and Numerical Aspects of Waves (Tunisia 2013) and the 24th International Conference on Domain Decomposition Methods in Science and Engineering (Svalbard, Norway  2017).

I am currently an Associate Editor of the journals: SIAM Review,  Mathematics of Computation, IMA Journal of Numerical Analysis, Advances in Computational Mathematics and Journal of Integral Equations and Applications. 

I am a Member of the Society of Industrial and Applied Mathematics and the London Mathematical Society and currently serve on the  EPSRC Peer Review College.