Prof Sachrajda’s research interests have largely been in developing Quantum Chromodynamics (QCD), the quantum field theory of the strong-nuclear force and implementing it studies of particle physics phenomenology. This has included both analytic calculations (using the technique of perturbation theory) and Lattice QCD, in which space and time are approximated by a discrete lattice of points and results are obtained by large-scale numerical simulations. The current aim of his research is to explore the limits of the successful, but incomplete, Standard Model (SM) of particle physics by confronting precise theoretical predictions obtained using Lattice QCD with experimental measurements. The goal is to find clues for physics Beyond the Standard Model which may provide candidates for Dark Matter and an explanation of the matter-antimatter asymmetry of the universe, as well as answers to numerous questions not explained within the SM.