D'Arcy Thompson was a biologist, a mathematician and a classicist.
He is primarily known for a single book--On Growth and Form--and indeed for a single chapter within it, on his 'theory of transformations', which shows how the differences between the forms of related species can be represented geometrically.
- Arthur W. D'Arcy Thompson and the theory of transformations. Nat Rev Genet. 2006 May;7(5):401-6. PMID: #16607399#