Cook County Board President Toni Preckwinkle’s shakeup of the hospital board has led a member to leave.

Benn Greenspan, a professor at the University of Illinois at Chicago School of Public Health, submitted his resignation Friday, citing “dismay” at changes Preckwinkle is making to the Health and Hospitals System board. Attempts to reach Greenspan for comment Monday were not successful.

Last week, Preckwinkle named four new directors, choosing not to reappoint board Chairman Warren Batts and director David Ansell. She also picked a replacement for a third director not seeking reappointment and a fourth who, like Greenspan, resigned one year early.

Greenspan’s resignation gives Preckwinkle a fifth appointment to the 11-member board that oversees the county's vast public health system.

On Monday, Preckwinkle said that although she backed Dr. Terry Mason when he won his post as interim Health and Hospitals CEO last year, she did not express a preference when the board later picked Dr. Ramanathan Raju as the person to permanently hold the job.

“He has been wonderful,” Preckwinkle said, referring to Raju. “I usually describe him as a godsend. This is a tough time for our system, and I can’t imagine anybody who is better qualified to lead our system than he is.”

Batts, meanwhile, said he initially told Preckwinkle he planned to leave, but then changed his mind when Raju asked him to stay on two more years. By then, Preckwinkle had picked his replacement, Batts said.