Tanford was hired as an assistant professor by the
University of Iowa, where, in 1954, he was then promoted to associate professor and, again, in 1959, to full professor. His postdoctoral research was concerned with
physical chemistry inspired by
Kai Linderstrom-Lang. He wrote, "What I had been taught was the more elegant process of using equations: equations that linked thermodynamic properties, dielectric constant and dipole moment, binding equilibria, and a host of other possibilities to revealing molecular characteristics." His book on
macromolecules,
The Physical Chemistry of Macromolecules (1961) took ten years to write, and
peer review "came only after submission of the final manuscript, and when it came it was a disaster. There were 2 reviewers and their criticism was scathing; I had got it all wrong, they said, and the book was declared effectively unpublishable...
John Wiley & Sons reluctantly agreed to publish...the book was in fact a success..." In 1973 Tanford published
The Hydrophobic Effect, which covered proteins in all their various guises including those within cell membranes. Although he popularized the term
hydrophobic effect, he attributed the origin of this concept to G. S. Hartley and the later efforts of Walter Kauzmann. Tanford gave great credit to the
giants upon whose shoulders he stood. and protein denaturation, in both cases as applied to lysozyme. He also published important work on protein hydration and on the viscosity of solutions of proteins. In 1981, Tanford became a founding member of the
World Cultural Council. Developing the theme of
proteins as autonomous effectors, like
robots, Charles and his partner Jacqueline Reynolds wrote ''Nature's Robots: A history of proteins'', published by
Oxford University Press in 2001. Tanford retired in 1988 but remained James B. Duke
Professor Emeritus in the Department of Cell Biology until his death in 2009. ==Honors==