The Michel Plancherel reference article from the English Wikipedia on 24-Apr-2004
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Michel Plancherel

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Michel Plancherel (1885-1967) was a Swiss mathematician. He was born in Bussy (Fribourg, Switzerland) and obtained his diploma in mathematics from the University of Fribourg in 1907. He was a professor in Fribourg (1911), and from 1920 at ETH Zurich.

He worked in the areas of mathematical analysis, mathematical physics and algebra, and is known for the Plancherel theorem in harmonic analysis.