Arthur Thomas Ippen (July 28, 1907 – April 5, 1974) was a notedhydrologist andengineer and was anInstitute Professor at theMassachusetts Institute of Technology. Born to German parents, he attended high school and college inAachen, Germany graduating with a degree in Civil Engineering in 1931. He then took anInstitute of International Education scholarship to study at theUniversity of Iowa but after his doctoral advisor,Floyd Nagler, died suddenly, Ippen transferred toCaltech to complete his Ph.D. His doctoral work, supervised byTheodore von Kármán andRobert T. Knapp, exploredsediment transport and open-channel high-velocity flows and represented the first American development of sonic wave analogy to free-surface flow.

Ippen's took his first faculty appointment atLehigh University in 1938 and remained there until he accepted a position atMIT in 1945. While at MIT, he took over the existing Hydrodynamics Laboratory and built up a research program of staff graduate students examining thesonic analogy,transient flows, instrumentation,turbulence,cavitation,shoaling waves,stratified flow, andsediment transport. The laboratory eventually expanded and became theRalph M. Parsons Laboratory for Water Resources and Hydrodynamics.

Ippen served as the President of theInternational Association for Hydraulic Research, was elected to theNational Academy of Engineering in April 1967 and theAmerican Academy of Arts and Sciences, and also received honorary doctorates from theUniversity of Toulouse,University of Karlsruhe, and theUniversity of Manchester.

He married Elisabeth Wagenplatz while at Caltech and had two children, Erich Peter and Karin Ann.Erich P. Ippen is a professor of electrical engineering and physics at MIT and a fellow member of the National Academy of Engineering. Elisabeth died in 1953 and Ippen married Ruth Calvert in 1955.

• Hunter Rouse."Memorial Tributes: National Academy of Engineering, Volume 1 (1979)". National Academies Press. Retrieved2007-04-22.

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