Driver's License Applications: Can My German Boyfriend Get a License if His German One Was Suspended for DUI

My question involves a driver's license issued by the State of: Illinois

My German BF and I will be moving to Chicago in the next few months because his company is transferring him there. He would like to get his driver's license, but his German driver's license was suspended a few years ago because of DUI (marijuana). Will the Illinois DMV allow him to drive in the US?

Does anyone have any information on this or know where I can find some?

Danke! :-)

- BB

Driver's License Applications: Can My German Boyfriend Get a License if His German One Was Suspended for DUI