The company that hires you and organizes your transfer will help you to provide the names of reliable tax advisors in Chicago. For your information, some of them as well as some useful resources are listed below.
International Tax Advisors (http://www.internationaltaxadvisors.com): ITA provides strategic tax planning services, and representation of clients in resolving matters with tax collection agencies in the United States and Canada.
KS International (http://www.ksi.org): KS International is an association of independent accounting firms located around the world that provide clients with a range of accounting, consulting and taxation services. They have five members located in the US.
Russel Novak & Company, LLC (http://www.rnco.com/index.html): Among their numerous areas of expertise is also Income tax planning, returns and compliance.
Bookkeepinghelp.com is a searchable Directory of Accounting, Bookkeeping & Tax Services in the U.S. and Canada. It can help you to locate the right provider in Chicago. Here is the link for the Chicago area: http://www.bookkeepinghelp.com/Metro/Chicago.asp
The IRS has a specific section for international taxpayers: http://www.irs.gov
For the Illinois tax system, check the Illinois Department of Revenue (IDOR): http://www.revenue.state.il.us/index.htm