Willem Hendrik Keesom (/ˈkeɪsoʊm/[1][2]) (21 June 1876, Texel – 3 March 1956, Leiden) was a Dutch physicist who, in 1926, invented a method to freeze liquid helium.

He was previously a student of Heike Kamerlingh Onnes, who had discovered superconductivity (a feat for which Kamerlingh Onnes received the 1913 Nobel Prize in Physics).

He also discovered the lambda point transition specific-heat maximum between Helium-I and Helium-II in 1930.

[3] In 1924 he became member of the Royal Netherlands Academy of Arts and Sciences.

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