John Frederick Clarke FRS (1 May 1927 – 11 June 2013) was a professor, an aeronautical engineer, and a pilot.

Piercy died in 1953,[3] then he temporarily advised by Leslie G. Whitehead and then finally by Alec David Young.

[1] His nomination reads: Professor Clarke is distinguished particularly for his analytical work on the gas dynamics of reacting flows.

He has shown how, in the presence of solid boundaries, flows are affected by dissociation, heat conduction and by relaxation of the internal molecular modes.

On flame structure he has used perturbation techniques to obtain realistic models in various geometries and has been able to show good agreement with experimental results; he has also studied explosive atmospheres under the influence of various disturbances.