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Donald J. Cosley has been representing Illinois residents in criminal defense and family law cases for over 20 years. He has a wealth of courtroom experience and an undying commitment to providing quality client service. He personally handles all aspects of his cases. When you call him with questions about your case, you will speak with him, your legal representative, and will not be passed off to a paralegal or subordinate. Extensive experience and responsive customer service are the hallmarks of the Law Offices of Donald J. Cosley.
Donald J. Cosley was admitted to practice in Illinois and the Northern District Court of Illinois in 1994, and before the United States Supreme Court in 2001. He has served in the following committee positions for the NWSBA:
He has also served as Chairperson for the Attorney Referral Service, Judges Night & Holiday Party, and as a coach or judge of mock trial from 2005 to 2008.
4
Practice Areas
33 years
33 years
33 years
Free Consultation
$0 first 30 minutes
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Chat withState: Illinois
Acquired: 1994
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3030 Salt Creek Drive, Suite 120, Arlington Heights, IL, 60004
Showing 1 - 5 of 21 client reviews from Avvo
Posted by Anna | August 18, 2025 | Hired Attorney
The worst possible attorney for divorce cases. If you want to lose your money and let your ex-get everything than he is perfect, because he won't defend you in court or work on you behave. In my case he prepared divorce settlement without even letting me know about it before court hearing. He worked ...
Posted by anonymous | January 13, 2023 | Hired Attorney
Does not review court paperwork for accuracy and then refuses to correct his mistakes and instead asks for more money to file motions in court to fix his own errors. Careless scoundrel attorney.
Posted by anonymous | August 6, 2022 | Hired Attorney
Cost me $2,000 for absolutely nothing. Needed help getting a restraining order and he couldn’t get it done. Never asked any real questions when I met with him and explained what happened. When it came to the hearing he barely objected while I was badgered and victim shamed.
Posted by Katie | April 7, 2022 | Hired Attorney
Ignored a judge’s order and made a simple case much much worse. He will waste your money BEWARE
Posted by Anastasia | June 10, 2021 | Hired Attorney
The best lawyer ever! I was involved in a messy high conflict divorce case and Donald was the steady hand and guiding light during the entire process. He got my case after another attorney that made a mess. I thank Donald for being very knowledgeable, responsive, organized, dedicated, calm, steady, ...
"Donald is a highly skilled criminal attorney. His experience gives him the ability to handle many different criminal matters. He is one of the most professional and ethical lawyers that I know. I do not hesitate to endorse this lawyer."
"I endorse this lawyer. Don's very knowledgeable and respected in the legal community. He fights hard for his clients and delivers positive results. I have no reservations endorsing and recommending Don."
"Don is a respected lawyer and a great source of information for other lawyers to consult with. His reputation is impeccable and I endorse him completely."
"I endorse this lawyer. Don has earned the respect of his all the lawyers in the community evidenced by Don being elected to president of the Bar Association. He can be counted on to provide the highest quality representation."
DUI and DWI lawyer
Criminal defense lawyer
Real estate lawyer
DUI and DWI lawyer
Family lawyer
Family lawyer
2016
Preeminent 5.0 out of 5, Martindale-Hubbell
2005
Distinguished Alumni Award, Buffalo Grove High School
2003 - Present
Attorney, Law Offices of Donald J. Cosley
2003 - Present
Northwest Suburban Bar AssociationChairman
2000 - Present
Northwest Suburban Bar AssociationChairman
1999 - Present
Northwest Suburban Bar AssociationChairman
1997 - Present
Northwest Suburban Bar AssociationMember
1994 - Present
Illinois State Bar AssociationMember
2011 - 2012
Northwest Suburban Bar AssociationPresident
2003 - 2006
Northwest Suburban Bar AssociationBoard of Governor
2001 - 2003
Northwest Suburban Bar AssociationChairman
2000 - 2003
Northwest Suburban Bar AssociationBoard of Governor
1999 - 2000
Northwest Suburban Bar AssociationParlimentarian
1994
Juris Doctorate
1991
BA - Bachelor of Arts
2010
Traffic Seminar
Spanish