Greg was born and raised only a few miles from the University of Dundee, where he started his scientific career as an undergraduate, receiving a BSc (Hons) in Biochemistry in 2001. Greg obtained his PhD at the Institute of Cancer Research, London, working with Richard Lamb to investigate novel components of the mTOR pathway. He then moved to the lab of Tony Pawson FRS at the Lunenfeld-Tanenbaum Research Institute, Toronto, where he used synthetic approaches to understand how modular protein complexes regulate pluripotent stem cell biology.

Greg established his research group in the MRC Protein Phosphorylation & Ubiquitylation Unit at the University of Dundee in 2014 to elucidate the role of understudied protein kinases in pluripotent stem cell regulation, funded by an MRC New Investigator Award and a Wellcome Trust/Royal Society Sir Henry Dale Fellowship. Greg was promoted to senior lecturer in 2019. His current research interest is using pluripotent stem cells to understand how dysregulated signal transduction causes intellectual disability, which is supported by a Wellcome Trust Discovery Award.