Max Planck

German physicist (1858–1947)

Max Karl Ernst Ludwig Planck (German: [ˈmaks ˈplaŋk] ; 23 April 1858 – 4 October 1947) was a German theoretical physicist. Planck made many contributions to theoretical physics, primarily in his role as the originator of quantum theory and one of the founders of modern physics, which revolutionized understanding of atomic and subatomic processes. He is known for the Planck constant, h {\displaystyle h} , which is of foundational importance for quantum physics, and which he used to derive a set of units, now called Planck units, expressed in terms of physical constants.

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