PS Macmahon specialized in photochemistry. He served in Indian Educational Service as Professor and Head, Department of Chemistry, Canning College, University of Lucknow.

Academic and Research Achievements: Macmahon did research on photochemical reactions at University of Oxford, UK.

Other Contributions: Mcmahon was greatly responsible for the establishment of the Indian Science Congress Association along with JL Simonsen and played a key role in developing chemical education in India.

Awards and Honours: Fellow, Institution of Chemists; Founder Member, Indian Science Congress Association.