How lucky we are, finding ourselves living on a planet with just the right conditions for liquid water to flow on its surface. More than that, we live in a universe old enough, and with just the right laws of physics, to forge the heavy elements from which we are made.

This 'lucky' situation underpins the anthropic principle, which related our very existence to the evolution of the cosmos. To some, the anthropic principle is little more than misguided hand-waving, whereas to others it tells us something fundamental about the universe. In this talk we will look at the successes and failures of this controversial idea, as well as looking to the future, where some think that the anthropic principle may be our only guide to one of the major outstanding questions in physics, namely how do we construct a theory of everything?

Born in Old South Wales, Geraint undertook a PhD at the University of Cambridge before spending several years at universities in the USA and Canada. He joined the Anglo-Australian Observatory in 2000, before moving to the University of Sydney where he is a Professor of Astrophysics.