In 1938, he was invited by Harvard University to America as a visiting lecturer on quantum theory and the philosophy of modern physics. The Germans having invaded Czechoslovakia as he was about to begin his scheduled lecture tour, Frank, a Jew, never returned to his position at Prague. And instead became a lecturer on physics and mathematics at Harvard from that year until his retirement in 1954.[1]
In 1947 he founded the Institute for the Unity of Science as part of the American Academy of Arts and Sciences (AAAS). This arose after Howard Mumford Jones (then president of the AAAS) had issued a call to overcome the fractionalization of knowledge, which he felt the AAAS well suited to address. The institute held regular meetings attracting a broad range of participants. Quine regarded the organisation as a "Vienna Circle in exile".[4] Politically Frank was a socialist.[5]
Astronomer Halton Arp described Frank's Philosophy of Science class at Harvard as being his favorite elective.[6]
His younger brother Josef Frank was a noted architect and designer.
Frank on Mach's principle
In lectures given during World War II at Harvard, Frank attributed to Mach himself the following graphic expression of Mach's principle:
"When the subway jerks, it's the fixed stars that throw you down."
In commenting on this formulation of the principle, Frank pointed out that Mach chose the subway for his example because it shows that inertial effects are not shielded (by the mass of the earth): The action of distant masses on the subway-rider's mass is direct and instantaneous. It is apparent why Mach's Principle, stated in this fashion, does not fit with Einstein's conception of the retardation of all distant action.
^Holton, Gerald (1993). Science and Anti-Science. Cambridge, Mass.: Harvard University Press.
^Beddeleem, Martin (2020). "Recoding Liberalism: Philosophy and Sociology of Science against Planning". Nine Lives of Neoliberalism(PDF). Plehwe, Dieter (Ed.); Slobodian, Quinn (Ed.); Mirowski, Philip (Ed.). Verso Books. p. 25. ISBN978-1-78873-255-0. In addition to Neurath, many of its important members like Rudolf Carnap, Hans Hahn, and Philip Frank had socialist convictions and conceived the philosophical work of the Circle as intimately connected with the rationalization of politics and progressive social change.
Holton, Gerald, Edwin C. Kemble, W. V. Quine, S. S. Stevens, and Morton G. White. “In Memory of Philipp Frank.”Philosophy of Science 35, no. 1 (1968): 1–5.