Alan joined the Birmingham group in 1989, working on the OPAL experiment. Here he was responsible for the data acquisition system for the Muon Endcap detector built by the Birmingham group, and studied electro-weak and heavy flavour physics.
Between 1998 and 2008 he worked on the BaBar experiment at SLAC, studying decays of B mesons to 3-body charmless states.
In 1991 he started working on preparation for the Large Hadron Collider, joining the Eagle proto-collaboration, which later merged with another team to become ATLAS. His main work has been on the design of the first level calorimeter trigger for ATLAS (L1Calo), particularly algorithm design and physics functionality, and upgrades for higher luminosity running. He is the L1Calo project leader within the UK, and was overall L1Calo offline software coordinator until 2019. He has studied heavy flavour and Higgs physics at ATLAS, and was leader of the Birmingham ATLAS team from 2011-2017.
In 2016 he joined the DUNE experiment at the Fermilab Long Baseline Neutrino Facility, leading a Birmingham team working on different aspects of the data-acquisition system and preparing for physics studies when the experiment starts operating in the mid-2020s.