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About me

I look forward to trying to identify unique solutions to complex real estate and corporate opportunities or problems that individuals and businesses find themselves facing.


Sometimes opportunities require both legal guidance and protection as well as capital formation and business expertise. Our attorneys have a solid base of MBA, accounting, engineering, and computer science educational backgrounds to supplement their legal experience and expertise so that they can bring a broader perspective to those opportunities.


Sometimes problems are self inflicted and other times they come completely from external circumstances. Therefore the firm that I started focuses on strategic solutions not judging the individual or the business. 


Our firm expects each employee to be empathetic to to our clients circumstance, cordial in our dealings with all parties and approach all engagements with integrity, realism and a committment to clear communications. We want the opportunity to serve your interests.




Practice areas


  1. Financial Services: 25%
  2. Estate Planning: 25%
  3. Corporate: 25%
  4. Real Estate: 25%

Attorney endorsements

4 total 

Are you an attorney? Endorse this lawyer

  • Todd Dean Jarvis

    I would not hesitate to recommend Dennis to anyone who wants a experienced, knowledgeable, and sincere advocate or counselor. Dennis has an incredible knack for developing creative and strategic solutions for his clients. He is reliable and optimistic. His creativity and experience come together to allow him to help investors and those seeking investment to come together and accomplish much.


    Todd Jarvis Intellectual Property Attorney
    Relationship: Worked for lawyer

  • Douglas Jeffery Newborn

    Dennis is one of the smartest people I know. He's always thinking outside the box and is imminently qualified to advise on any matter that requires the intricate knowledge of the intersection of law and finance. Whether your project is large or small, Dennis is a must on your team of advisors.


    Douglas Newborn Bankruptcy & Debt Attorney
    Relationship: Worked for lawyer

Contact info

Breen Olson & Trenton LLP

4720 North Oracle Road Suite 100
Tucson, AR, 85704


AZActive 197805/27/2015

Professional misconduct

This lawyer was disciplined by a state licensing authority.

  1. Suspension
    issued in AZ, 1992


    Suspension means an attorney lost his or her license to practice law for a period of time. The attorney typically returns to practicing law when the suspension expires.

Avvo contributions
Legal answers
Work experience
TitleCompany nameDuration
Managing PartnerBreen Olson & Trenton LLP2001 - Present
Vice PresidentSunChase Holdiings1993 - 2001
AttorneyDennis M Breen III1978 - 1992
Trust Investment -Vice PresidentChase Manhattan Bank, New York1968 - 1977
Association namePosition nameDuration
Rotary Club of Oro ValleyMember2015 - Present
School nameMajorDegreeGraduated
Fordham University School of LawLawJD - Juris Doctor1974
Fordham University School of LawFinanceMBA - Master of Business Administration1973
Fordham UniversityPsychologyBS - Bachelor of Science1967