Walensky, 51, an infectious-diseases specialist at Harvard Medical School and Massachusetts General Hospital, is expected to become CDC director after Biden is inaugurated.
Redfield kept a low profile during his first two years in office after being appointed by the Trump administration in 2018.
Much of that has to do with cycles of funding for the national public health system that rise in reaction to a crisis and then fall, hurting efforts to prevent the next crisis.
Last week, Biden said he would ask for $160 billion for vaccinations and other public health programs, including an effort to expand the public health workforce by 100,000 jobs.
Georgetown's Westmoreland called for a law or other measure to prohibit political appointees from having editorial review of CDC science and to ban them from controlling when the agency releases information.