Which chemist collaborated with Christopher Ingold on the 1937 studies of reaction kinetics and nucleophilic substitution of alkyl halides?

Explanation

Edward Davies Hughes collaborated closely with Christopher Ingold on nucleophilic substitution mechanisms. Their 1937 studies of reaction kinetics and the Walden inversion form part of the experimental work underlying the distinction between unimolecular and bimolecular substitution, commonly called SN1 and SN2.