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Maureen O'Leary

Estate planning Attorney at Mequon, WI

5.0   1 review

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About Maureen

Learn Maureen’s areas of practice.

Maureen L. O'Leary is the owner of O'Leary-Guth Law Office, S.C., located in Thiensville, Wisconsin (Ozaukee County).

Maureen practices in the areas of estate planning, estate administration, probate, trust administration, real estate, business, accounting, and taxation.  Maureen has significant experience with complex business, trust, and estate issues, and she frequently represents business owners in corporate planning, sales and acquisitions, dispute resolution, succession planning and tax planning.  Maureen also prepares estate, gift, and income tax returns, with a focus on fiduciary and business income tax returns.

Maureen received her Juris Doctor degree with honors from Marquette University Law School in 2008.  Prior to law school, Maureen began her career in the business world, as a shareholder and Operations Manager of a local company, where she helped turn one location into a national franchise.  

Maureen is licensed to practice in all Wisconsin State Courts and in the United States District Court for the Eastern District of Wisconsin.  Maureen is a member of the Ozaukee County Bar Association and the Milwaukee Bar Association.  Maureen routinely presents trust, estate and business related presentations to professional groups.  She is also an active member of the Thiensville-Mequon Rotary Club and the Mequon/Thiensville Chamber of Commerce.  

Photos and videos

Licensed for 14 years
State WI
Status Good Standing
Acquired 2008
Updated 03/05/2023

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

Contact Maureen

O'Leary-Guth Law Office, S.C.
1251 W. Glen Oaks Lane
Mequon, WI, 53092


5.0 / 5.0
  1 customer review
5 Star
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1 Star
Posted by Bill | May 14, 2010
Professional and extremely knowledgeable. Made me feel comfortable and valued.


  • Free Consultation 60 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 10.0 (Superb)

Work Experience

  • Owner
  • O'Leary-Guth Law Office, S.C.
  • 2019 - Present
  • Partner
  • WIllms, S.C.
  • 2014 - 2018
  • Attorney
  • WILLMS, S.C.
  • 2008 - 2013


  • Marquette U
  • Juris Doctor Law Degree
  • 2008
  • Carroll College
  • BA - Bachelor of Arts
  • 2004

Legal Cases

  • Various estate, trust and business cases


  • American College of Trusts and Estates Counsel
  • Fellow
  • 2021 - Present
  • Business Law Section of The State Bar of Wisconsin
  • Director
  • 2019 - Present
  • Milwaukee Bar Association
  • Member
  • 2018 - Present
  • Thiensville-Mequon Rotary Club
  • Member
  • 2018 - Present
  • Milwaukee Estate Planning Forum
  • Member
  • 2018 - Present
  • Ozaukee County Bar Association
  • Member
  • 2017 - Present
  • Green Acres Boxer Rescue
  • Treasurer
  • 2017 - Present
  • Mequon-Thiensville Masterminds
  • Member
  • 2016 - Present
  • Hubert J. Mueller Society
  • Member
  • 2013 - Present
  • State Bar of Wisconsin
  • Member
  • 2008 - Present
  • United States District Court
  • Eastern District of Wisconsin Member
  • 2008 - Present
View all associations

Languages Spoken

  • English

Honors and Awards

  • Business of the Year
  • Mequon-Thiensville Chamber of Commerce
  • 2022
  • Best Law Firm Ranking
  • U.S. News - Best Lawyers
  • 2018
  • 10 Best Attorneys (Estate Planning)
  • American Institute of Legal Counsel
  • 2018
  • CALI Excellence for the Future Award (Labor Law)
  • Marquette University Law School
  • 2008
View all awards


  • On Balance (WICPA's Magazine)
  • Estate Tax Returns for Nontaxable Estates After the Tax Cuts and Jobs Act of 2017
  • 2020
  • Liemberg publication
  • Wisconsin Exhibit to "Executing Estate Planning Documents During the Pandemic and the Slow Return to the “New Normal”"
  • 2020
  • American College of Trust and Estate Council
  • A Powerful Tool: Modification or Termination of a Noncharitable Irrevocable Trust by Consent
  • 2019
View all publications

Speaking Engagements

  • Milwaukee Estate Planning Forum
  • Legal Considerations When Serving as Trustee
  • 2019
  • Thiensville-Mequon Rotary Club
  • Charitable Giving Strategies
  • 2018
  • State Bar of Wisconsin
  • Business Succession Planning in Wisconsin: Conflict Prevention and Resolution
  • 2018
  • National Business Institute.
  • Trust Administration: Top Challenges
  • 2018
  • National Business Institute.
  • Trusts 101
  • 2017
  • National Business Institute
  • Estate Administration from Start to Finish
  • 2017
View all speaking engagements

Attorney endorsements

Received (1)
Given (2)
Endorse Maureen
Estate planning Attorney | Jan 23
Relationship: Family member
"Maureen has extensive knowledge of business, tax, trusts and estates law and how they interact. She addresses details other attorneys leave out or fail to take into consideration with each estate plan she tailors for her clients. I would not hesitate to send anyone looking for estate planning assistance to Maureen. She is an exceptional attorney and person."
Estate planning
Corporate and incorporation

Avvo Contributions

This attorney hasn't created any legal answers in Q&A or legal guides recently on Avvo.

Mequon Estate planning Lawyer Maureen O'Leary
Maureen O'Leary
Estate planning Attorney
Mequon, WI
Licensed for 14 years
Free Consultation