Dr Stringer is a theoretical physicist whose research career originally focussed on cosmology and galaxy evolution, until his mounting concern for our own planet bought him back down to Earth to work on terrestrial problems. Since then, he has been applying the various mathematical modelling techniques developed over ten-year career studying the formation of galaxies to a variety of other systems, from models of island reforestation and interacting wildlife populations, to future systems of power generation, resource supply chains, and energy markets.