Professor James Geach

Astrophysicist / Writer

Jim Geach @jgeach

j.geach at

Centre for Astrophysics Research, School of Physics, Astronomy & Mathematics, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, United Kingdom

About me and my research

I am a Royal Society University Research Fellow and Professor of Astrophysics based in the Centre for Astrophysics Research (CAR) at the University of Hertfordshire. I studied Physics at Imperial College London as an undergraduate, and then did my Ph.D. at Durham University under the expert tutelage of Ian Smail. After completing my thesis, I was a post-doc at Durham and Banting Fellow at McGill University before coming to CAR in 2013.

My research generally focuses on the formation and evolution of galaxies and observational cosmology, but I also investigate novel uses of machine learning in astrophysics and explore the application of these techniques in other fields, including medicine and agriculture. I like to dabble. Recently my interest has been in developing new techniques for the exploration and analysis of Earth Observation data. You can see some of this work here.

For a complete record of my research, you can find an up-to-date listing of publications and pre-prints at the NASA Astrophysics Data System. You can also read about some of my research in the press:

Galactic blow out
Lyman Alpha Blobs: Galaxies Coming of Age in Cosmic Blobs
Herschel Sees Intergalactic Bridge Aglow With Stars
Galaxy Goes Green in Burning Stellar Fuel
Astronomers Map Dark Matter Throughout the Entire Universe


I like trying to break down complex ideas into simple language, with a goal of explaining the cutting edge of astronomical research in a way that anyone can understand. I have written two popular science books, both published by Reaktion Books:


I have written feature articles for Scientific American and Sky & Telescope. I regularly contribute to The Conversation and also write the occasional piece on Medium.


Rob Crain and myself have been developing a set of tools to create bespoke visualizations of cosmological simulations and volumetric observational data. Our work has appeared on the front cover of Nature and Scientific American, and we also contributed to Terrence Malick's incredible Voyage Of Time