John Arthur “Jack” Jacobs (13 April 1916 – 13 December 2003) was a British geophysicist and mathematician, whose primary area of research was geomagnetism.
[1] The return of Leopold Infeld to Poland in 1950 gave Jacobs the opportunity to move from the UK to Canada, take up the position of associate professor of Applied Mathematics at the University of Toronto.
[5] The University of British Columbia hired Jacobs as Professor of Physics in 1957 and within ten years he had created the Institute of Earth Sciences and the Department of Geophysics and Astronomy.
[2] In 1994 he was awarded the John Adam Fleming Medal by the American Geophysical Union (AGU), for original research in geomagnetism and atmospheric electricity.
[9] He retired from the University of Cambridge in 1983 and later moved to Aberystwyth, Wales where his third wife Ann Grace Wintle[2] held an academic position and was later promoted to a Professorship.
[9][2] He went on to make significant contributions to the theory of the origin of the core and its evolution and developed the starting point for ideas on core-mantle stability.