FRANKEL, HEINRICH WALTER (1879–1945), German metallurgist. Frankel worked at universities of Heidelberg, Goettingen, and Zurich before joining the Frankfurt Institute of Physical Chemistry (1913). In 1919 he became professor of metallurgy at University of Frankfurt. Nazi accession to power forced him to migrate in the early 1930s to the U.S, where he became a researcher for American Smelting and Refining Company, Barber, New Jersey. He was the author of Metallurgie: physikalisch-chemische Grundlagen (1922).