From 1999-2000 he worked as an Alexander von Humboldt research fellow in the laboratory of Achim Mueller at the University of Bielefeld (1999–2000).

[7] By making a modular system he was able to build a programming language for chemistry named XDL.

[8] This was extended to ensure the "chemputer" was universal[9] and this was demonstrated by reading the chemistry synthesis literature and converting it into executable chemical code.

[10] A spinoff company lead by Cronin, called Chemify, was launched in 2019 and raised £33m in 2023.

[13][14][15][16] In 2022 Cronin was suspended by the Royal Society of Chemistry for three months for breaching their code of conduct, following an investigation of a complaint made by a third party.