(Chicago, IL) -- One of Governor Pat Quinn's top aides is calling it quits. Deputy Chief of Staff Sean O'Shea has just two more days on the job. He's held the post for three years and is responsible for keeping watch over which senior officials are hired at IDOT. The transportation agency has been under scrutiny in recent months for hiring people based on political connections instead of skill. Quinn's office insists that O'Shea is not leaving because of the ongoing hiring controversy.