Dr Tim Gregory is a nuclear chemist at the United Kingdom National Nuclear Laboratory where he counts radioactive atoms for a living. He is also a speaker and broadcaster. He has a PhD in isotope cosmochemistry from the University of Bristol and a first class master's degree in Geology with Planetary Science from the University of Manchester.

When he is not in the lab or writing, Tim is usually either hiking, fell running, or playing his guitar. You can get in touch with him via Goodreads or his website. (All views are his own, not those of his employer.)