Thomas John Dixon Halliday is a British palaeobiologist and author.
Halliday earned a degree in natural sciences (zoology) from Pembroke College, Cambridge, followed by a master's in palaeobiology from the University of Bristol, and a PhD in palaeobiology from University College London.
[1] Halliday was awarded the Linnean Society's John C Marsden Medal for the best doctorate in biological studies.
[2] In 2022, Halliday published Otherlands: A World In The Making about the history of life on Earth.
[3] The Sunday Times noted its "Sixteen superbly vivid snapshots of our prehistoric world".