The Illinois Tollway Authority has a gap in its top ranks following the exit of two executives.
Inspector General James Wagner retired in June after serving five years at the tollway, a spokeswoman said.
And Toll Operations Chief Jeffrey Redding left Aug. 11 after nine years. Tollway officials gave no explanation for Redding's departure, saying they did not comment on personnel matters.
The departures come as the agency is transitioning to a new board appointed by Gov. Bruce Rauner and a new executive director.
Wagner, a former FBI agent, was selected by Gov. Pat Quinn following the Gov. Rod Blagojevich scandal as a reform to ensure independent oversight of the agency. The General Assembly changed state law to make the governor appoint the tollway inspector general subject to Senate approval.
Under Wagner, the tollway conducted numerous investigations that resulted in arrests and firings for employee misconduct and the recovery of stolen money.
He also uncovered that the tollway had transferred more than $33 million to the state's general revenue fund under Blagojevich, which is contrary to Illinois law. Wagner's salary was $137,808 in 2014; Redding's was $151,189.