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Kathleen Heidbrier O'Neill Tran

Business Attorney at Rohnert Park, CA

Not yet reviewed

also known as Katie O'Neill Tran, Kathleen O'Neill

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About Kathleen

Learn Kathleen’s areas of practice.

Practice areas
  1. Business
    Contracts and Agreements, Entity Formations including C-Corps, LLCs, and S-Corps. Drafting ByLaws, Operating Agreements, Buy-Sell Agreements, Partnership Agreements. Financing Documents.

  2. Trademark application
    Drafting and filing trademark applications. Trademark defense.

  3. Contracts and agreements
    Drafting and negotiating contracts.

  4. Intellectual property
    Filing Trademarks and Copyrights. Assisting in trademark and copyright infringement cases.

  5. Corporate and incorporation

Katie O'Neill Tran, the founder of O’Neill Tran Law, has been practicing law since 2007. She has a breadth of experience in trademark and business law. Katie has spent over ten years assisting entrepreneurs and business owners with a wide array of legal issues; from filing initial trademarks and entity formation, through obtaining investor funding, and negotiating contracts with employees, third-party vendors, and clients.

Katie served as the outside general corporate counsel for companies across the United States and the world, including those based in California, Chicago, New York, and Dublin (Ireland). She has experience not only in domestic business and trademark law, but also in international intellectual property and commercial law. Katie is an active member of the bar and is licensed to practice law in California, Illinois, New York, and Ireland.

Photos and videos

Licensed for 14 years
State CA
Status Active
Acquired 2018
Updated 12/03/2022
State NY
Status Due to Register within 30 Days of Birthday
Acquired 2008
Updated 11/17/2022
State IL
Status Administrative - Not Authorized to Practice
Acquired 2009
Updated 01/06/2023

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

Contact Kathleen

O'Neill Tran Law
6366 Commerce Blvd.
Rohnert Park, CA, 94928


Not yet reviewed. Review Kathleen


  • Free Consultation 30 minutes
  • Hourly Rates $ 185-250 per hour
Payment methods
Check, Credit Card


AVVO RATING 6.9 (Good)

Work Experience

  • Founding Attorney
  • O'Neill Tran Law
  • 2018 - Present
  • Attorney
  • G&G Law
  • 2013 - 2018
  • Contract Attorney
  • Lovell Stewart Halbien LLP
  • 2011 - 2016
  • U.S. Qualified Attorney
  • A&L Goodbody
  • 2009 - 2011
  • Attorney
  • Jeffrey Miller & Associates, PC
  • 2007 - 2008
View all work experience


  • University College Dublin
  • LL.M - Master of Laws
  • 2010
  • Michigan State UNV COL
  • JD - Juris Doctor
  • 2007

Legal Cases

  • Trademark Filings
  • Successful trademark registration


  • American Bar Association
  • Member
  • 2018 - Present
  • Sonoma County Bar Association
  • Member
  • 2018 - Present
  • Wine Country Networking Alliance
  • Member
  • 2018 - Present
  • Illinois State Bar Association
  • Member
  • 2009 - 2019
View all associations

Languages Spoken

  • English


  • Semi-Finalist; Fourth Best Advocate
  • Kauffman Securities Law Moot Court Competition
  • 2007
  • Semi-Finalist
  • John Marshall School of Law Moot Court Competition
  • 2006

Speaking Engagements

  • Work Petaluma
  • Trademark Law
  • 2018

Attorney endorsements

Received (2)
Given (0)
Endorse Kathleen
Trademark application Attorney | Jan 30
Relationship: Worked together on matter
"I have worked with Katie on several matters in the area of trademarks and business law. She is a great attorney that has a lot of background knowledge and takes the time to research any issues that arise to ensure she is giving the best advice. She is very friendly and understanding, and clients always have great things to say about her."
Business Attorney | Jan 11
Relationship: Supervised lawyer
"Katie is the most knowledgeable attorney I know in the area of trademark law. She goes above and beyond the specific work required to satiate her endless curiosity about various trademark questions. Her ability to communicate this information and educate her clients is top-notch, and she provides impeccable customer service. I highly recommend Katie."
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Avvo Contributions

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Rohnert Park Business Lawyer Kathleen Heidbrier O'Neill Tran
Kathleen Heidbrier O'Neill Tran
Business Attorney
Rohnert Park, CA
Licensed for 14 years
Free Consultation