The long-established RHUL ATLAS group is renowned for its expertise in physics (Higgs, top quark and exotic signatures of new physics), statistical methods as well as trigger and data acquisition systems. The group is also very involved in the upcoming upgrades of the detector in view of the High-Luminosity running of the LHC. The experimental observation of Higgs particle production in association with top quarks was first announced in 2018. The successful candidate will make use of the 13 TeV collisions dataset at the LHC to investigate the production of the Higgs bosons in association with top quark decays. The analysis will focus on the Higgs boson decay to a pair of b quarks and the combination with other possible Higgs decays will also be performed. This Higgs channel is crucial for measuring the coupling between the Higgs and the top quark and thereby testing the consistency of the Standard Model. Using the full LHC Run 2 dataset will allow much-increased precision of such tests and could point to signs of physics beyond the Standard Model. In addition, PhD students in the RHUL ATLAS group contribute to the development of the ATLAS trigger system, as well as to the operation of the ATLAS detector at CERN.