Herbert John Frost was a senior physicist and Head of the Physics Section at the Munitions Supply Laboratories (MSL ). He had an important role, overseeing the extensive activities of the Physics Section and ensuring the availability of testing equipment.
Frost attended the very first meeting of Australian physicists on 26 June 1940, which was organised by L.J. Hartnett, Director of Ordnance Production. Frost was involved with the Optical Munitions Panel from that point until the Panel was disbanded in November 1945.