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Donald J Cosley

Divorce and separation Attorney at Arlington Heights, IL

4.3   20 reviews
  • Licensed for 29 years
    State IL
    Acquired 1994
    Active and Authorized to Practice Law No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Donald

Learn Donald’s areas of practice.

Practice areas
  1. Divorce and separation
    Practicing for 25 years in family law cases specializing in divorce and parenting issues

    31 years

  2. DUI and DWI
    Practicing for 25 years in family law cases primarily out of the Rolling Meadows courthouse

    31 years

  3. Criminal defense
    Practicing for 25 years in family law cases especially order of protection and domestic battery cases

    31 years

  4. Speeding and traffic ticket
    Practicing for 25 years in family law cases primarily out of the Rolling Meadows cases

    31 years

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.

  • Accessible: When you call, we make it a priority to respond quickly. We promise to give clear answers in language that makes sense.
  • Experience: Opposing attorneys, prosecutors and judges know that we have built our success on integrity and hard work. Knowing the key people involved in your case means understanding the process and expectations to reach a desirable outcome.
  • Reputation: Legal professionals throughout the Greater Chicago metro area know that we prepare our cases and arguments diligently and have our evidence and arguments in order. We have earned an excellent reputation for thoroughness and focused legal representation.
Free Initial Consultation

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:

  • Parliamentarian 1999-2000
  • Board of Governors 2000-2003; 2003-2006
  • Executive Board:
    • Secretary 2006-2007
    • Treasurer 2007-2008
    • Vice President 2008-2009
    • Vice President 2009-2010
    • Executive Vice President 2010-2011
    • President 2011-2012
  • Long Range Planning Committee 2007-2008

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.


Law Offices of Donald J. Cosley
3030 Salt Creek Drive
Suite 120
Arlington Heights, IL, 60004

Divorce lawyers nearby


4.3 / 5.0
  20 customer reviews
Posted by Anastasia | June 10, 2021
This review is from a person who hired this attorney.
| Hired Attorney
The best lawyer ever!!!
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, and being a strong advocate during the case. When I felt lost because of the process, Donald was there to help make sense of things. He knows all the answers for all the questions. I also thank his team for being responsive, organized, and lending a hand to my case. For those who may need to deal with high conflict personalities, I would highly recommend Donald for being very effective, steady, and strong in negotiation. In the end, I received the results I was looking for and wouldn't hesitate to recommend Donald Cosley. I’m so grateful for the opportunities work with you.
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Posted by anonymous | March 24, 2018
This review is from a person who hired this attorney.
| Hired Attorney
Professional, thoughtful, and passionate
He shows incredible empathy and professionalism in his approach. He did everything possible to help me in a difficult situation. My life would have been turned upside down if he didn’t push for the outcome that was granted. He is responsive and treats you like a human being even though a mistake was made. He sets the bar high!
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Posted by Dinesh | February 18, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Misdemeanor Charge Reduced
As a non-immigrant worker, I am thrilled to have my misdemeanor charge reduced to a speeding violation and offered court supervision without conviction. Don is nice to talk to and treats people well. He looks to be easy going and this calms your nerves.
Posted by Lorene | January 11, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Relocation Approval Case For My Daughter
I had a previous atty I was upset about via her job performance, lack of support, lack of personal touch (I dealt with her office) not her. For 6 months of anguish and anxiety going to court nothing happened. I found Don through his good reviews since 2 good friends kept telling me that my prev atty was no good & to find another one. She withdrew fr my case unprofessionally by letter not even a phone call right before my trial date. I was devastated. Im unemployed and was yet billed 1500 plus another 850 which Ive asked for her to bill other party hopefully. She wanted another 2500K when I couldnt provide that I guess this is what happened but still. So I called Don right away knowing he was good for it having a consultation with him prior (He prev suggested things that we could do to support my case etc, was supportive, understood). He got on a phone call directly with me both times plus directly responds to email right away. Got me into his office that day & with no money, only credit left that my brother was helping me with. He worked out a payment plan option that worked for me plus trying to get an order pushed thru for other party to pay considering my unemployment. I immediately hired him after he said told me what my 2 options were which I took him up on the Emergency Relocation Motion. Next day papers were ready, I went in to sign. A few days later we were in court in front of a judge already. Im still pending court decision but at least something is way happening on Don's behalf vs my other atty I wasted money on who did nothing for me in 6 months nor supported my case. I really recommend Don, He's quick, supportive & gets to work with you right away. Very professional and hands on. Im very happy thus far even though my court decision is yet pending my trial date. I wish I had gone to him sooner, I probably wouldn't still be sitting here majorly stressing out on taking a job offer out of state and trying to get to family since I have none left here. I feel like my future has been on pause trying to provide for them. Don is my only answer and way out thus far. Its horrible to feel like your made a prisoner of the state trying to make a better life or future for your family trying to move out of state. If you need a good caring atty Don is the way to go. Thanks.
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Posted by anonymous | August 28, 2015
This review is from a person who hired this attorney.
| Hired Attorney
Class B Misdemeanor, Speeding
With no prior traffic offenses I had no idea what to expect when entering the court systems. Internet education made me anxious and advised that an attorney was necessary. With so many attorneys to choose from and no direct referral I took a chance and chose Donald Cosley. The result was very good.
Posted by Michael | April 1, 2015
Cosley Rating
Don has represented me well. He was punctual, prompt, and thorough when communicating. The options given were clear and in the end, he was able to work the situation out properly.
Posted by Andy | March 19, 2015
Great lawyer to have on your side.
Don has helped me through a tough divorce. He explains options very well and can handle issues in a timely fashion. Don is also a great lawyer to have for my real estate purchase that is currently on going.
Posted by anonymous | March 18, 2015
Excellent lawyer!
Don has handled a range of my legal issues from family law to real estate and traffic! He is on your side and is always extremely professional! Highly recommend!
Posted by Mike | March 18, 2015
Donald Cosley is hands down the best in his industry. I would never even hire anyone else.
I have been a client of Donald Cosley since 2002 and I still use him today. Even after moving to NY he was able to resolve all my issues remotely without me present. Hands down the best !!!
Posted by jim | March 18, 2015
great attorney
very dependable prompt about returning calls let you know the price up front has never let me down he does what he says he's going to do never any Bologna
Posted by anonymous | July 21, 2014
Top Notch
After being poorly represented by a previous attorney and receiving an unjust conviction Don won an appeal to reopen my case. He got my battery conviction, which is on your record for life, reduced to one year supervision. I couldn't have asked for better representation. He explained the law so that I understood it, was very patient and always optimistic. I would highly recommend Don Cosley.
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Posted by anonymous | May 6, 2014
Revoked License
Donald helped me get my drivers license back. He was well informed and guided me through the various demands imposed by the state of Illinois.
Posted by anonymous | November 29, 2011
was surprised at how quickly he always returned my calls. Got me out of a big mess. I was so happy with the outcome. Very knowledgeable and made me feel very confident to have him by my side.
Posted by anonymous | November 3, 2011
Awesome Lawyer
Very good laywer. Got my 41 mph over the limit class a misdemeanor down to a 39, helped me avoid mandatory community service and reduced my fine
Posted by anonymous | June 10, 2009
I hired Mr. Cosley in regards to a criminal matter and I thought that Mr. Cosley was very knowledgeable and he was able to get my case dismissed. Mr. Cosley had explained every option and avenue with regards to my case and very informative.
Posted by anonymous | June 8, 2009
An excellent attorney
I used Mr. Cosley for my divorce matter and I thought he did a superb job! My case was very emotional and complex and he spent a lot of time communicating with me about my case during the almost two year divorce case. He was knew the law and I was easily accessable by phone. He got me a better settlement than I had anticipated
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Posted by Andrew | July 11, 2017
This review is from a person who hired this attorney.
| Hired Attorney
A good, but very unprofessional attorney
I hired Don Cosley to represent me last year and he was nothing but unprofessional throughout. He was 25 minutes late to the hearing and did not call to tell me he would be there soon. I even called his office and they said that he would be there eventually but would not contact him for me. Once he showed up, Don left the trial twice to talk to other clients. The judge yelled at me twice to go find him when my it was my turn. I did eventually find him but it just made the judge more impatient. He did a decent job during the hearing when he finally got there thus the 2 stars. I later called his office and left him a voice mail on his cell phone about obtaining documentation that my case was dismissed and never received a call back. I guess he only returns calls when money is on the line.
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Posted by anonymous | January 13, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Incompetent con artist 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
This review is from a person who hired this attorney.
| Hired Attorney
Not thorough and doesn’t care. Just wants the money.
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
This review is from a person who hired this attorney.
| Hired Attorney
Ignored a judge’s order and made a simple case much much worse. He will waste your money BEWARE
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  • Free Consultation 30 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 10.0 (Superb)

Work Experience

  • Attorney
  • Law Offices of Donald J. Cosley
  • 2003 - Present


  • John Marshall Law School, Chicago
  • Juris Doctorate
  • 1994
  • DePauw University
  • BA - Bachelor of Arts
  • 1991


  • Northwest Suburban Bar Association
  • Chairman
  • 2003 - Present
  • Northwest Suburban Bar Association
  • Chairman
  • 2000 - Present
  • Northwest Suburban Bar Association
  • Chairman
  • 1999 - Present
  • Northwest Suburban Bar Association
  • Member
  • 1997 - Present
  • Illinois State Bar Association
  • Member
  • 1994 - Present
  • Northwest Suburban Bar Association
  • President
  • 2011 - 2012
  • Northwest Suburban Bar Association
  • Board of Governor
  • 2003 - 2006
  • Northwest Suburban Bar Association
  • Chairman
  • 2001 - 2003
  • Northwest Suburban Bar Association
  • Board of Governor
  • 2000 - 2003
  • Northwest Suburban Bar Association
  • Parlimentarian
  • 1999 - 2000
View all associations

Languages Spoken

  • Spanish

Honors and Awards

  • Preeminent 5.0 out of 5
  • Martindale-Hubbell
  • 2016
  • Distinguished Alumni Award
  • Buffalo Grove High School
  • 2005

Speaking Engagements

  • School District 214
  • Traffic Seminar
  • 2010

Attorney endorsements

Received (8)
Given (6)
Endorse Donald
Criminal defense Attorney | Aug 12
Relationship: Fellow lawyer in community
"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."
Criminal defense Attorney | Mar 25
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Divorce and separation Attorney | Mar 16
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Criminal defense Attorney | Mar 16
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Divorce and separation Attorney | Dec 15
Relationship: Fellow lawyer in community
"Donald is an incredibly smart, honest, hardworking, and wise lawyer."
Divorce and separation Attorney | Mar 19
Relationship: Fellow lawyer in community
"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."
Divorce and separation Attorney | Nov 26
Relationship: Fellow lawyer in community
"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."
Divorce and separation Attorney | Sep 13
Relationship: Fellow lawyer in community
"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."
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Avvo Contributions

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Arlington Heights Divorce and separation Lawyer Donald J Cosley
Donald J Cosley
Divorce and separation Attorney
Arlington Heights, IL
Licensed for 29 years
Free Consultation