At 7:02 a.m. on Sept. 30, 2010, scant hours after an op-ed he had written for the San Francisco Chronicle criticizing his university appeared in print, Michael Wilkes received an e-mail from an administrator at the University of California at Davis. Wilkes, a professor at the medical school, was told that he would no longer lead a program sequence that taught better patient care, and support for a Hungarian student exchange program he headed would be withdrawn.

Within weeks, Wilkes was told that he would be removed as director of global health for the UC Davis Health System. ...