Philip Aston is a Professor of Mathematics at the University of Surrey. His areas of interest have changed over the years from dynamical systems with symmetry, through mathematical biology and on to mathematical data science and machine learning. He co-developed the Symmetric Projection Attractor Reconstruction (SPAR) method that converts an approximately periodic signal into a compact image and has many applications to the analysis of physiological signals such as the electrocardiogram (ECG) and photoplethysmography (PPG) signals.