John's primary research is on particle physics beyond the Standard Model, but he also strays into related areas of high-energy astrophysics and cosmology. Within particle physics, he is particularly interested in predictions for collider experiments and the interpretation of their results, and his interests in astrophysics and cosmology include dark matter and strategies to detect it, as well as dark energy and cosmological inflation.
Much of his research concerns supersymmetry, which he considers to be one of the most promising possible extensions of the Standard Model, and he is actively working on searches for supersymmetric particles at the LHC and as astrophysical dark matter.
He is also interested in models of quantum gravity, particularly those derived from string theory, and is looking for possible experimental probes of such models, either in accelerator experiments or in high-energy astrophysics and cosmology.