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Kareen O'Brien

Divorce and separation Attorney at Scottsdale, AZ

5.0   10 reviews
  • State Years
    Arizona - AZ 12 years
    California - CA 19 years
  • Licensed for 12 years
    State AZ
    Acquired 2012
    Active No misconduct found
  • Licensed for 19 years
    State CA
    Acquired 2004
    Inactive No misconduct found

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

About Kareen

Learn Kareen’s areas of practice.

As a former Los Angeles County District Attorney and Maricopa County Attorney in Sex Crimes, I've heard and seen it all. I've been helping families in crisis since 2006. I've spent my entire career in the courtroom and I know how to separate the truth from lies, and true controversies from insignificant drama. I know how to effectively present your side to a superior court judge. I'm in your corner and I will fight for you.


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5.0 / 5.0
  10 customer reviews
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Posted by anonymous | January 24, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Best Lawyer Out There By Far
We hired Kareen to help with a very nasty Custody battle one where the other side was trying to win at no cost and doing it dirty. Kareen stepped in and saved the day. She help get equal custody and help stop a very unethical lawyer from writing and sending lie filled emails that were merely the other sides way of trying to make the mother in the case look bad and in fact it all backfired thanks to Kareen O'Brien. We owe her more than simple words could ever say, she gave us the strength to hold on and ride it out and in the end the Judge saw right through all the lies and deceit, and the mother was reunited with her daughter and our family is whole again. Thank You Kareen
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Posted by anonymous | December 28, 2015
This review is from a person who hired this attorney.
| Hired Attorney
Best choice for a thorough lawyer.
I am absolutely happy with Kareen O'Brien. She was passionate about my case and she was completely confident in the courtroom. Even though I had quite a tricky case, she was able to help me figure out my best options.
Posted by anonymous | December 17, 2015
This review is from a person who hired this attorney.
| Hired Attorney
I would rate her 10 stars if they gave that option!!!!
I was engaged in a highly contested and volatile custody battle. I was not represented by an attorney at first and I was so scared. When your child and their well being are at stake you don't want to take I sought out the representation of an attorney. I was referred to Kareen through a family was the very best choice I ever made!!! From the start she saw clearly my perspective and I really appreciated that she took the time to explain the process to me. She answered my questions with care. I could tell she knew what she was doing. Her confidence gave me comfort which to me was priceless when going through such a stressful and scary experience. Her court room etiquette is to be admired. What I most appreciated above all else is that I could see Kareen genuinely cared about my case and that she sincerely understood how I felt. I am so very thankful to her. The results that I got in my case were better than I had originally hoped for. I am pleased to say that because of Kareens efforts and skill my son has a safe happy healthy future ahead of him. If ever I need to be represented in court again...without question Kareen is the only attorney I would ever trust to handle my affairs.
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Posted by Steve | August 28, 2015
This review is from a person who hired this attorney.
| Hired Attorney
After firing a non-ambitious attorney. My wife and I found Kareen on the AVVO site. From our first consultation to the final not guilty verdict, we have been nothing but impressed with her professional conduct and aggressive style. I would recommend Kareen to anyone needing a criminal defense attorney. I am convinced that had we kept our previous attorney, my son would be facing many years in prison.
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Posted by Matt | August 27, 2015
This review is from a person who hired this attorney.
| Hired Attorney
I was a client of Mrs. O'Brien and was incarerated for an alleged crime that I never did. I was facing 35-99 years. She stepped in and took over my case. We went to trial and won our verdict of Not Guilty. Thank You Kareen.
Posted by anonymous | May 1, 2015
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Choosing an attorney
We were looking for advice and we found Kareen on Avvo. We called and met with Kareen and found her to be very knowledgeable and professional.
Posted by Michele | August 18, 2014
Knowledgeable, Multifaceted Attorney
Kareen is a very knowledgeable, multifaceted attorney who is passionate about her work and cares about her clients. We appreciate her direct and honest approach when handling our recent legal matter. She responds quickly to our inquiries. She takes the time to explain the nuances of the law, as it relates to our case, to ensure that we understand our rights. We feel very confident about Kareen's legal abilities and representation on our behalf. We have already recommended Kareen to our family and friends.
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Posted by Edward | August 18, 2014
Knowledgeable and prompt service
Ms. O'Brien is very knowledgeable in the legal field. All questions I asked we answered promptly and seemed to be very accurate when I researched them further. My case was handled professionally and with a fair cost. I would use Ms. O'Brien again and would recommend her to my friends.
Posted by anonymous | August 17, 2014
Outstanding, very knowledgeable and reliable!! A+++
Amazing, reliable, outstanding. Very knowledgeable in family law and keeps you up to date every step of the way. I have and will continue to recomend her to everyone of my friends and family. Also I intent on using her services again if needed.
Posted by Christina | August 8, 2014
Christina Cope Behle
Ms. O'Brien has been a life saver. My previous family law attorney billed me for so many hours and did not provide quality representation. I was recommended to Ms. O'Brien by a friend who had worked with her in her previous criminal practice. Since retaining Ms. O'Brien I have felt confident that she has my best interest in mind and also have been very impressed with her knowledge, ability and devotion to providing me with quality representation at a reasonable rate. I would highly recommend Ms. O'Brien as she cares about the area of family law practice.
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Contact for Details


AVVO RATING 9.9 (Superb)

Work Experience

  • Associate Attorney
  • Stewart Law Group
  • 2016 - Present
  • Attorney
  • Law Offices of Kareen O'Brien, PLLC
  • 2013 - 2016
  • Deputy County Attorney
  • Maricopa County Attorney's Ofc
  • 2012 - 2013
  • Deputy District Attorney
  • Los Angeles District Attorney's Office
  • 2006 - 2012
View all work experience


  • Southwestern University School of Law
  • JD - Juris Doctor
  • 2004
  • University of California - Irvine
  • BA - Bachelor of Arts
  • 1991

Sample of Legal Cases

  • In re the matter of K.
  • Father prevailed
  • State v. J.
  • Not Guilty


  • State Bar Military Legal Assistance Committee
  • Member
  • 2016 - Present
  • Mountain Ridge High School Mock Trial Team
  • Team Advisor
  • 2016 - Present
  • State Bar of Arizona, Family Law Section
  • Member
  • 2014 - Present
  • State Bar of Arizona, Criminal Justice Section
  • Member
  • 2014 - Present
View all associations

Languages Spoken

  • English

Honors and Awards

  • 10 Best Family Law Attorney
  • American Institute of Family Law Attorneys
  • 2021
  • 10 Best Attorney
  • American Institute of Family Law Attorneys
  • 2020
  • 10 Best Attorney
  • American Institute of Family Law Attorneys
  • 2019
  • Top 10 Attorneys
  • National Academy Of Family Law Attorneys
  • 2019
  • 10 Best Female Family Law Attorney
  • American Institute of Family Law Attorneys
  • 2019
  • Top 10 Attorney
  • Attorney and Practice Magazine
  • 2019
  • Excel 2016 Introduction
  • ONLC Training Centers
  • 2016
  • Microsoft Office OneNote 2013
  • ONLC Training Centers
  • 2016
  • 2nd Place Brief and Semi-Finalist Team
  • Cardozo Moot Court Competition
  • 2002
View all awards


  • Southwestern Journal of Law and Trade in the Americas
  • Giving Rise To A Claim: Is the FTAIA's Section 6A(2) an Antitrust Plaintiff's Key to the Courthouse Door?
  • 2003

Speaking Engagements

  • Los Angeles County District Attorney's Office-Branch CLE Program
  • Helping Your Witness Experience "Total Recall" On the Stand (Hearsay Exceptions)
  • 2010
  • Los Angeles County District Attorney Saturday Seminar
  • The Uniform Act To Secure Witnesses, Business Records, Hearsay, and the Constitution
  • 2010

Attorney endorsements

Received (3)
Given (2)
Endorse Kareen
Divorce and separation Attorney | Dec 15
Relationship: Fellow lawyer in community
"Kareen is an outstanding lawyer and tenacious trial attorney. Her preparation and skill is truly amazing and I highly recommend her for any divorce or child custody matter."
Family Attorney | Sep 19
Relationship: Opposing Counsel on matter
"Kareen was opposing counsel on a divorce case. It was a true pleasure to work with her as she was knowledgeable about the law and the facts of the case. She advocated strongly for her client while always being professional and respectful of all persons involved. I endorse Kareen."
Criminal defense Attorney | Jan 27
Relationship: Opposing Counsel on matter
"Kareen and I met when she was working in the Prosecutors office and we had a trial as opposing counsel. She was thorough, proficient and professional in her handling of the case. She was extremely knowledgeable on the law and presented a compelling case to the jury. I hold her in high regard."
Criminal defense
Criminal defense

Avvo Contributions

44 Legal Answers 0 Legal Guides
Scottsdale Divorce and separation Lawyer Kareen O'Brien
Kareen O'Brien
Divorce and separation Attorney
Scottsdale, AZ
Licensed for 19 years