I am a cosmologist, studying the nature of dark energy using maps of millions of galaxies and the voids between them. I work at the Institute of Cosmology and Gravitation at the University of Portsmouth, where I am a research fellow. I mange some projects in the data analysis pipeline for the European Space Agency space mission Euclid, which will be one of the world's biggest cosmology experiments. I am also involved in the Dark Energy Spectroscopic Instrument, the Sloan Digital Sky Survey, and the Dark Energy Survey experiments.