Donald J. Cosley

Rolling Meadows, Illinois


Donald J. Cosley has practiced law since 1994, assisting many clients in divorce and related family law, criminal defense, DUI, traffic violations, and drivers' license reinstatementsy. He is admitted to practice in Illinois, the U.S. District Court Northern District of Illinois, and the U.S. Supreme Court. He prides himself on his firm's ability to provide aggressive and personable service to clients from all walks of life.

Mr. Cosley belongs to several professional associations. He is a member of the Chicago Bar Association, the Illinois State Bar Association, and the National Association of Criminal Defense Lawyers. Mr. Cosley is extremely active as a member of the Northwest Suburban Bar Association and has been part of the organization's Board of Governors, Foundation Board, and has served as Parliamentarian. He has also served as Chairperson on several committees, including the Holiday Party Committee, the Judges Night Committee, and the Committee responsible for the group's Supreme Court Trip. Mr. Cosley also served as Chairperson for the Attorney Referral Service.

Areas of Practice

  • Family Law
  • Divorce
  • Custody & Visitation
  • Child Support
  • Criminal Law
  • Traffic Violations
  • White Collar Crimes

Bar Admissions

  • Illinois, 1994
  • U.S. District Court Northern District of Illinois, 1994
  • U.S. Supreme Court, 2001


  • John Marshall Law School, 1994
    • J.D.
  • DePauw University, Greencastle, IN, 1991
    • B.A.

Professional Associations and Memberships

  • Illinois State Bar Association, Member
  • Northwest Suburban Bar Association (NWSBA), Member
  • Northwest Suburban Bar Association, President, 2011-2012
  • Northwest Suburban Bar Association, Vice President, 2008-2011
  • Northwest Suburban Bar Association, Treasurer, 2007-2008
  • Northwest Suburban Bar Association, Secretary, 2006-2007
  • Northwest Suburban Bar Association, Parliamentarian, 1999 - 2000
  • Northwest Suburban Bar Association, Board of Governors, 2000 - 2003, 2003 - 2006
  • Northwest Suburban Bar Association, Holiday Party Chairperson, 1999, 2000 & 2003
  • Northwest Suburban Bar Association, Chairperson for Supreme Court Trip, 2001 - 2003
  • Northwest Suburban Bar Association, Judges Night Co-Chairperson, 2001 - 2011
  • Northwest Suburban Bar Association, Attorney Referral Service Chairperson, 2001 - 2006
  • Northwest Suburban Bar Association, Foundation Board, 2001 - 2005
  • Northwest Suburban Bar Association, Long Range Planning Committee, 2007 - 2008
  • NWSBA & Suburban Bar Coalition, Judicial Screening
  • Northwest Suburban Bar Association, Committee Vice President, 2009 - 2010
  • Northwest Suburban Bar Association, Committee Executive Vice President, 2010 - 2011
  • Northwest Suburban Bar Association, Nominating Committee 2010
  • Golf Outing, Mock Trial, Nominee Committee, Attorney Referral Service, Judges by Night & Holiday Party, Chairperson
  • Suburban Bar Coalition
    • Mock Trial, Coach & Judge, 2005 - 2008
  • Arlington Heights Youth Basketball Association
    • President, 2015-2017
    • Board Member, 2011-present
    • Coach, 2011-present

Honors and Awards

  • Buffalo Grove High School Distinguished Alumni Award, 2005
  • Illinois State Bar Association
  • Northwest Suburban Bar Association

Contact Our Firm

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Cosley Law Office
Arlington Office Park
1855 Rohlwing Road, Suite D
Rolling Meadows, IL 60008
Rolling Meadows Law Office

Phone: 847-253-3100
Cell Phone: 847-340-5517
Fax: 847-253-3434
Email the Firm
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At the Law Offices of Donald J. Cosley, we represent clients in Illinois, including the cities of Rolling Meadows, Schaumburg, Palatine, Arlington Heights, Mount Prospect, Buffalo Grove, Barrington, Elk Grove Village, Inverness, Wheeling, Long Grove and Mundelein, as well as Cook County, Lake County, DuPage County and throughout the Chicago, IL, metropolitan area.

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