Peter’s research career has been focussed on understanding integrated systems-level responses – particularly cardiorespiratory and metabolic responses – to hypoxia, to exercise and, more recently, to variations in iron status. He has recently been working on methods for airway molecular flow sensing using laser absorption spectroscopy – a technique developed in conjunction with physical chemists at Oxford. Peter is now applying this technique as a non-invasive means to study aspects of inhomogeneity in the lung in both health and disease.