Skip to main content

Oliver Thomas O'Brien

Tax Attorney at Portland, OR

5.0   5 reviews
  • Licensed for 12 years
    State OR
    Acquired 2011
    Active No misconduct found

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

About Oliver

Learn Oliver’s areas of practice.

Practice areas
  1. Tax
    Collection Defense, Audit Assistance, State and Federal (IRS).

    13 years

  2. Bankruptcy and debt
    Personal Chapter 7 Bankruptcy, Collection Defense

    10 years

  3. Family
    Divorce, Custody, Support, and Parenting Time Modification.

    11 years

Throughout my legal career, I have devoted my skill and experience to helping my clients find peace of mind where family interests and finances intersect. I deal in a variety of legal issues ranging from collection defense with the IRS to important family law issues such as Divorce, Custody, Parenting Time, and Child Support. In my work I strive to give my clients and their cases the personal attention they deserve.

I began my career as an attorney for one of Portland’s most respected commercial litigation firms. There I honed my skills on complex litigation, and obtained excellent skills in strategy, negotiation, complex procedure, and research.  I now focus my skills on serving individuals facing family law and tax issues.


I am an avid soccer fanatic and can typically be spotted roving the sidelines of any Timbers home match or catching a spot of Premier League action at one of the marvelous soccer pubs in town.

Photos and videos


Corey Law Group
420 SW Washington Street
Suite 400
Portland, OR, 97204-1127

Tax lawyers nearby


5.0 / 5.0
  5 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by anonymous | May 12, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Excellent Attorney
I had a messy and very stressful family custody case. Mr. O'Brien was a savior. He was very patient, thorough, and professional. He helped me win my case decisively. I highly recommend him and this law firm.
Posted by Wendy | July 9, 2015
Excellent Negotiator
Oliver is handling All my Personal and real estate matters. I own a small farm and have had multiple Issues come up. I found him to be knowledgeable compassionate understanding intelligent and extremely effective! Oliver is an excellent negotiator!
Posted by Shaun | June 13, 2015
Wise well beyond his years
I retained Mr. O'Brien to handle a legal matter for me recently and was very impressed to put it mildly. He was professional, thorough, responsive, and successful.
Posted by Emily | June 11, 2015
Awesome Lawyer
Mr. O'Brian is absolutely one of the best lawyers in Portland. He handled my case with ease during a difficult time period for me. He was very professional, trustworthy and knowledgeable. With his experience, intelligence and his ability to interpret the facts and present them in the most straightforward way, I would recommend him to anyone!
Read less
Posted by Lennon | June 11, 2015
Excellent personal council
Oliver helped me through several fairly intricate personal and professional legal questions, including the tax implications of structuring a new business and startup investments. He was accessible and knowledgeable, but also willing to admit where he needed to do more research and get back to me with a recommendation. I look forward to working with him again in the future.
Read less


  • Hourly Rates $ 200-270 per hour
  • Retainer Always
Payment methods
Cash, Check, Credit Card


AVVO RATING 8.5 (Excellent)

Work Experience

  • Contract Attorney
  • Greene & Markley
  • 2011 - 2013


  • Lewis & Clark Law School
  • JD - Juris Doctor
  • 2011
  • Hope College
  • BA - Bachelor of Arts
  • 2007

Sample of Legal Cases

  • Spousal Support Termination
  • Favorable Settlement
  • Parenting Time Enforcement
  • Increased Parenting Time


  • Oregon State Bar
  • 2011 - Present
  • Oregon State Bar, Taxation Section
  • N/A
  • Oregon State Bar, Family Law Section
  • N/A

Languages Spoken

  • English

Honors and Awards

  • Moot Court Honor Board
  • Lewis & Clark Law School
  • 2010
  • Regional Mock Trial Invitational (First Place)
  • Lewis & Clark Law School
  • 2009


Attorney endorsements

Received (11)
Given (19)
Endorse Oliver
Family Attorney | May 03
Relationship: Opposing Counsel on matter
"Oliver is an effective and efficient opposing counsel. He is able to effectively present his client's position to get results in the courtroom and in settlement negotiation."
Unknown Attorney | Jun 18
Relationship: Fellow lawyer in community
"Oliver is a skilled attorney and excellent advocate for his clients. I look forward to working with him."
Family Attorney | Sep 07
Relationship: Fellow lawyer in community
"Oliver is hard working, intelligent and experienced attorney with a great personality. I would recommend him highly to anyone seeking legal counsel."
Family Attorney | Feb 06
Relationship: Fellow lawyer in community
"Oliver is dedicated and hardworking and practices with the highest integrity. He cares about his clients and getting the best outcome possible for them given the facts of their case and the law. I highly recommend him."
Unknown Attorney | Jan 25
Relationship: Fellow lawyer in community
"Mr. O'Brien is a consummate professional. He has repeatedly demonstrated his knowledge, dedication and caring. I do not hesitate to refer clients to Mr. O'Brien."
Tax Attorney | Dec 03
Relationship: Fellow lawyer in community
"Oliver is a pro at tax law. I always refer people to him when they need a tax lawyer and they are always impressed with his skill and knowledge."
Family Attorney | Jun 25
Relationship: Fellow lawyer in community
"Oliver is thorough, hard-working, and considerate in his practice of law. I recommend him for this reason."
Bankruptcy and debt Attorney | Jun 11
Relationship: Fellow lawyer in community
"Oliver is my first referral choice for bankruptcy matters. He is very knowledgeable and understands the intricacies of the law. But his greatest strength in my opinion is his ability to communicate with his clients about complex issues in a way that is easy to understand and leads to solid decision-making."
Family Attorney | Jun 11
Relationship: Worked together on matter
"Oliver is an excellent and highly ethical attorney. I have recommended him for cases with confidence, and will continue to do so in the future. He is particularly skilled in the courtroom and would be a great choice for any prospective client."
Bankruptcy and debt Attorney | May 13
Relationship: Worked together on matter
"Oliver is careful and conscientious in his work as an attorney. His intelligence makes him a good attorney. He cares about his clients and makes their outcome something that matters to him. That's what makes him an exceptional attorney. I would not hesitate to recommend Oliver to a client of mine because I know he will take good care of them."
Tax Attorney | May 11
Relationship: Worked together on matter
"Oliver is an excellent attorney who will work tirelessly for you. He is my go-to guy for both Bankruptcy and Tax issues, though he is also a stellar advocate as a trial attorney. I endorse him without hesitation."
View more endorsements