A brilliant scientist and an outstanding personality who was one of the founders of modern photochemistry-Michael Kasha-is the subject of this Essay. Kasha's rule and the Kasha effect both bear his name, and he also discovered the chemical production of singlet molecular oxygen, and was a pioneer of excited-state proton transfer systems. Kasha combined his passion for chemistry and physics with that for music, photography, and botany.
Keywords: Kasha, Michael; history of science; photochemistry; singlet oxygen.
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