In 1956 he founded the influential Journal of Fluid Mechanics[2] which he edited for some forty years.

[3] As an applied mathematician (and for some years at Cambridge a co-worker with Sir Geoffrey Taylor in the field of turbulent flow), he was a keen advocate of the need for physical understanding and sound experimental basis.

His An Introduction to Fluid Dynamics (CUP, 1967) is still considered a classic of the subject, and has been re-issued in the Cambridge Mathematical Library series, following strong current demand.

[4] Unusual for an 'elementary' textbook of that era, it presented a treatment in which the properties of a real viscous fluid were fully emphasised.

[5] He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1959.