The outbreak of war prevented the presentation of his Ph.D. thesis, and delayed publication of some of his work, which did finally appear in the Proceedings of the Royal Society, many years later.
Near the end of the war, he was appointed to the British Intelligence Objectives Sub-Committee and was sent Germany where he worked at the Luftwaffe Research centre in Brunswick.
When the Atomic Weapons Research Establishment (AWRE) was created at Aldermaston, many of the Waltham Abbey staff played important roles in setting it up and developing its activities.
Wiseman was among these and he was appointed Deputy Director in 1953, transferring to the Ministry of Supply in 1956 to oversee related production work.
He directed and reported major studies of the physical chemistry of propellants and explosions - a logical continuation of his work at Waltham Abbey.