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About me

I am a Boston native and a Harvard Law School graduate and have been 41 years in Phoenix.  I am a litigator and my practice is mostly construction law and real estate law, with a large amount of service as a mediator and an arbitrator.  Most of the cases in which I serve as either are construction law based, but many have business law and real estate law components as well. I have mediated 90 cases in the last 12 years, some for AAA but many as a private mediator.  I am fluent in Spanish and recently handled an arbitration in which one side testified in Spanish and I asked questions of the witnesses in that language.  I am listed in Best Lawyers, Top Litigators, and have recently been named in a list of Arizona's 50 top lawyers.   I do a lot of extra-curricular work and am head of the ADR Section of the State Bar this year, serve on a City of Phoenix Task Force regarding Budget Issues, serve as head of the Quality Care Committee for St Joseph's Hospital (where I am in my third year on the Community Booard of the Hospital, and am involved in using Probationer labor to do construction repairs on buildings owned by charitable coprporations.  I have nine other extracurricular committments.


Languages spoken: Spanish

Practice areas


  1. Appeals: 34%
  2. Construction: 33%
  3. Litigation: 33%



Hourly ($410/hour)

Attorney endorsements

2 total 

Are you an attorney? Endorse this lawyer

  • Isabel M Humphrey

    David is probably the most honest, hardest-working lawyer in town. You can't go wrong with him.


    Isabel Humphrey Appeals Attorney
    Relationship: Co-worker

  • Hamid Jabbar

    I had the great fortune of working for Dave Tierney. His knowledge of the law is unassailable and his legal reasoning is always spot-on. He is an outstanding lawyer and I endorse him without hesitation.


    Hamid Jabbar Internet Attorney
    Relationship: Worked for lawyer

Contact info

Sacks Tierney P.A.

4250 North Drinkwater Boulevard 4th Floor
Scottsdale, AZ, 85251


AZActive 196907/02/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Top 100 Irish Lawyers in AmericaIrish America Newspaper, NYC2009
Arizona's top lawyersRanking Arizona 20062006
The Best Lawyers in AmericaThe Best Lawyers in America2006
Top Commercial Litigation LawyersAmerican Lawyer and Corp Counsel Magazine2006
Association namePosition nameDuration
American Arbitration AssociationMember1990 - Present
Maricopa County Bar AssociationMember1970 - Present
American Bar AssociationMember1969 - Present
State Bar of ArizonaMember1969 - Present
Publication nameTitleDate
Practice Manual for Construction Law Sec St BarEditor and2003
Arizona Attorney MagazineLimitations on Closing Arguments2003
UnknownConstruction Defect Litigation2002
UnknownAmendments to Laws Governing2000
Arizona Contractors Association Almanac, State Bar Construction Law Section NewsletterUnless and Until' Clauses: Slow Pay for Subcontractors1989
Southwest ContractorControlling the Means of Construction: New Exposure for Architects on Construction Jobs1985
Tempe Daily NewsOur Prisons: Upside Down & Backwards Priorities1984
Scottsdale Progress Saturday MagazineAlternatives to Incarceration1980
Weekly Gazette Convention IssuePrison Crisis: a Need for Rehabilitative Programs1979
Arizona Bar JournalArizona Corrections: Accomplishments and Unfinished Business1978
Arizona Bar JournalThe Future of Corrections in Arizona1977
School nameMajorDegreeGraduated
Harvard University Law SchoolLawJD - Juris Doctor1965
Brandeis UniversityN/ABA - Bachelor of Arts1962
Speaking engagements
Conference nameTitleDate
ABA Conference on ADRMediating the Non-Litigated Matter2010