Neil Turok is Director and Niels Bohr Chair at the Perimeter Institute for Theoretical Physics in Ontario, Canada. Previously he was Professor of Physics at Princeton and Chair of Mathematical Physics at Cambridge. He is also Founder and Chair of the African Institute for Mathematical Sciences. Turok develops and tests theories of the early universe, making a number of successful predictions within the standard dark energy/dark matter cosmology. He pioneered investigations of many theoretical scenarios including cosmic strings, inflationary “bubble” universes and cyclic models. Most recently, he disproved the Hartle-Hawking proposal for the beginning of inflationary universes. He is developing a new alternative – the CPT-invariant universe – which also provides the simplest-yet explanation for the cosmic dark matter. In 2016 Turok was awarded an Honorary Fellowship of the UK Institute of Physics and the John Torrence Tate Medal of the American Institute of Physics for International Leadership in Physics.