Phillip Garth Law studied Physics at the University of Melbourne. His involvement in the work of the Optical Munitions Panel included research into metrology (measurement); development of a spherometer to measure lens curvatures; the analysis of captured optical instruments; and tropic proofing. Law was the Assistant Secretary, and later Acting Secretary, to the Optical Munitions Panel.
Law was also a Lecturer in Physics at the University of Melbourne 1943-48. After the war, he led the Australian National Antarctic Research Expeditions (ANARE) and became further involved in Antarctic research and conservation issues.