Charles Wintersteen & Associates, formerly (Wintersteen & Perez LLC), is a full-service immigration law firm with over 25 years of experience. You may reach us at: Charles Wintersteen & Associates, 53 W. Jackson Blvd., Suite 809, Chicago, Illinois 60604. Phone: 312-566-0301; Fax: 312-588-0437. You may also email Charles Wintersteen at chw@charleswintersteen.com.