Donald J Cosley

Donald J Cosley

4.0
Rating: 10.0

Licensed for 31 years

Divorce and separation Lawyer at Arlington Heights, IL
Practice Areas: Divorce & Separation, DUI & DWI, Criminal Defense, Speeding & Traffic Ticket

3030 Salt Creek Drive, Suite 120, Arlington Heights, IL

About Donald

Biography

Practice Areas

4

Practice Areas

Divorce and Separation 65%

Practicing for 25 years in family law cases specializing in divorce and parenting issues

33 years

65%
DUI and DWI 15%

Practicing for 25 years in family law cases primarily out of the Rolling Meadows courthouse

33 years

15%
Criminal Defense 10%

Practicing for 25 years in family law cases especially order of protection and domestic battery cases

33 years

10%
Speeding and Traffic Ticket 10%

Practicing for 25 years in family law cases primarily out of the Rolling Meadows cases

33 years

10%

Fees and Rates

Cost

Free Consultation

$0 first 30 minutes


Payment Methods

  • Cash
  • Check
  • Credit Card

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Licenses

Licensed in Illinois for 31 years

State: Illinois

Acquired: 1994

Active and Authorized to Practice Law

No misconduct found

Location

Law Offices of Donald J. Cosley

3030 Salt Creek Drive, Suite 120, Arlington Heights, IL, 60004

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Donald J Cosley's Reviews

Avvo Review Score

4.0 /5.0

22 Client Reviews

Showing 1 - 5 of 7 reviews | Professionalism

Posted by Candi | July 25, 2026

Helped exploit an elderly man with dementia and has no shame

I have known Donald Cosley my entire life. Our mothers were friends. My father, however, documented his distrust of Don Cosley nearly a decade before he died. In 2016, dad sent me estate-planning documents and explicitly wrote that he wanted me to use an attorney other than Don for his estate adminis...tration, and any legal services for that matter, because Don can't be trusted. My father was a financial planner with meticulous attention to detail, both for his clients and for himself, and was the most honest man on earth. Despite that written warning, Cosley Law Office prepared a new Will for my dad in December 2022, just 5 weeks after I had gone over the documents with dad in detail, with the clear understanding that they were final because my father's dementia was worsening. Dad had very recently moved into an assisted living facility, and was under mandatory quarantine for an active COVID infection when the Will was drafted. Dad and I were close and in daily contact during that difficult period, including a text exchange and a 71 minute phone call on the same day. He never told me he had changed his estate plan, I can say with pretty solid certainty that dad didn't even know he'd made the changes. He was removed from the facility where he was quarantined, and dragged to Don's office, sick with COVID. As I understand, these facilities have safeguards in place when a resident is signing important documents, and it is my belief that dad was taken out of the facility to circumvent that oversight. The Will itself contains obvious errors, including misspelling a beneficiary's name and female pronouns appearing in documents for a male testator. For a document that radically changed my father’s meticulously planned estate, those errors matter. After my father died and I learned of the changes, I contacted Mr. Cosley immediately and raised serious concerns about my father’s condition, potential abuse and exploitation of a person with dementia, the circumstances surrounding the Will, and the use of Cosley Law Office’s services. I expected concern and transparency. I did not receive that. Rather, he attacked my character and insisted that my dad and I were estranged when the Will was drafted, despite extensive call logs and text messages showing that we were close and in daily contact. For over a year, I have been asking Don to help me hold accountable the people who abused and exploited my father. Not only has he refused, he continues to attack my character, which is likely how he will respond to this review. This review is not about disappointment over an inheritance. It is about an elderly man with dementia, dependent on others, signing a Will while newly in assisted living and sick with COVID; an attorney with lifelong family ties; a document undoing decades of meticulous planning containing obvious and sloppy errors; and a complete lack of transparency or accountability after serious concerns were raised. I would not trust Cosley Law Office with any estate, or other legal matter. Not only can he not be trusted, he has no shame or remorse for the profound harm his conduct has caused.

Posted by Anna | August 18, 2025 | Hired Attorney

Be aware

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 ...strictly with opposite site attorney and with my ex on it. I wasn't even allowed to read settlement in court just asked to sign it in front of Judge with his lame statement "trust me everything is fine when I rise my objection, please just sign it". I think he should be disbarred for taking full advantage on me.

Posted by anonymous | January 13, 2023 | 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 Katie | April 07, 2022 | Hired Attorney

DON’T WASTE YOUR MONEY

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!!!

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.

See All Client Reviews

Donald J Cosley's Lawyer Endorsements

Endorse Donald
Stavri Vako Esq. headshot
Stavri Vako

Criminal defense lawyer | 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."

Steven H. Mevorah headshot
Steven Mevorah

Criminal defense lawyer | Mar 25

Relationship: Fellow lawyer in community

"I endorse this lawyer."

Christopher M. Cosley headshot
Christopher Cosley

Divorce and separation lawyer | Mar 16

Relationship: Fellow lawyer in community

"I endorse this lawyer."

Albert John Salvi headshot
Albert Salvi

Criminal defense lawyer | Mar 16

Relationship: Fellow lawyer in community

"I endorse this lawyer."

Shawn Michael McKenna headshot
Shawn McKenna

Divorce and separation lawyer | Dec 15

Relationship: Fellow lawyer in community

"Donald is an incredibly smart, honest, hardworking, and wise lawyer."

Moe A. Ahmad headshot
Moe Ahmad

Divorce and separation lawyer | 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."

John William Callahan headshot
John Callahan

Divorce and separation lawyer | 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."

Gary A. Newland headshot
Gary Newland

Divorce and separation lawyer | 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."

View All Endorsements
Christopher M. Cosley headshot
Christopher Cosley

DUI and DWI lawyer

Moe A. Ahmad headshot
Moe Ahmad

Criminal defense lawyer

Michael John Cozzi headshot
Michael Cozzi

Real estate lawyer

John William Callahan headshot
John Callahan

DUI and DWI lawyer

Michael A. Meschino headshot
Michael Meschino

Family lawyer

Miriam Cooper headshot
Miriam Cooper

Family lawyer

Experience

Rating:  10.0 (Superb)

Honors

2016

Preeminent 5.0 out of 5, Martindale-Hubbell

2005

Distinguished Alumni Award, Buffalo Grove High School

Work Experience

2003 - Present

Attorney, Law Offices of Donald J. Cosley

Associations

2003 - Present

Northwest Suburban Bar Association

Chairman

2000 - Present

Northwest Suburban Bar Association

Chairman

1999 - Present

Northwest Suburban Bar Association

Chairman

1997 - Present

Northwest Suburban Bar Association

Member

1994 - Present

Illinois State Bar Association

Member

2011 - 2012

Northwest Suburban Bar Association

President

2003 - 2006

Northwest Suburban Bar Association

Board of Governor

2001 - 2003

Northwest Suburban Bar Association

Chairman

2000 - 2003

Northwest Suburban Bar Association

Board of Governor

1999 - 2000

Northwest Suburban Bar Association

Parlimentarian

Education

1994

John Marshall Law School, Chicago

Juris Doctorate

1991

DePauw University

BA - Bachelor of Arts

Speaking Engagements

2010

School District 214

Traffic Seminar

Languages

Spanish

Avvo Rating

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