Overview
Currently active research areas include:-

The ZEPLIN-III dark matter search experiment based in the underground Boulby mine laboratory in the UK. As a founder member of the UKDMC I have been involved in a number of dark matter search experiments looking to test the hypothesis that the dark matter thought to be associated with our galaxy is in the form of a new particle species which might be detectable as very rare events in specialised well shielded low-activity experiments. ZEPLIN-III is the last of these UK-led experiments using the most advanced xenon based technology. I intitiated this experiment in 2000 and led it as PI and Spokesperson until 2010. LUX-ZEPLIN(III) was initiated as a scientific collaboration in 2009 and has since then been developed into a full experiment and is now operating in the Sanford Underground Research Laboratory (SURF) producing world leading results.  Its successor, XLZD, is being designed.  

The search for gravitational waves using a space-based observatory called LISA. This involves carrying out interferometry between proof-masses contained in separated spacecraft and provides access to a wealth of astrophysics and fundamental tests of General Relativity which cannot be done in any other way. A successful mission would revolutionise our ability to study the universe. I was a member of the LIST (LISA International Science Team) appointed by ESA. My group delivered flight hardware for the successful LISA Pathfinder technology demonstrator launched by ESA in 2015.

The pursuit of fundmental physics measurements at the interface of gravity and quantujm mechanics using space missions. I was Co-PI for the STEP proposal to carry out an equivalence principle measurement, and consequently a Co-I on MICROSCOPE which went on to carry out a space mission giving world beating results with unprecedented sensitivity.