Justin’s research has garnered an international reputation for innovative biophysical chemistry approaches based on combining mass measurement with other experimental methods, simulations, and quantitative thermodynamic and kinetic analyses. This has allowed him and his group to change our thinking as to how proteins assemble, interact, and even evolve. After a degree in Chemistry at the University of Oxford, Justin obtained his PhD from the University of Cambridge for the development and application of novel mass spectrometry approaches. He was awarded fellowships from the Medical Research Council and Royal Society, and appointed to faculty at the University of Oxford in 2012 as an Associate Professor in Biophysical Chemistry, and Tutorial Fellow in Physical Chemistry at University College. Justin has been recognised by the Cell Stress Society International with the Alfred Tissières Award, the Howard Prize Lecture from the Biophysical Sciences Institute at Durham, and the Norman Heatley Award from the Royal Society of Chemistry in 2019. His group’s research impacts broadly the interface between chemistry and the life sciences. Their insights have been important to understanding molecular chaperone (mal)function in humans, and the stress tolerance of plants; and their innovations in mass measurement approaches have provided new means for researchers to quantify biomolecules and their interactions.