Sacks Tierney P.A.

Member of Meritas: 173 full-service law firms serving more than 200 markets worldwide

Scottsdale-Phoenix | 480.425.2600

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Sacks Tierney is a Best Law Firms selectee for Arbitration (Regional Tier 1) and Mediation (Regional Tier 2)


Ranking Arizona #1 in ADR for 2019

Sacks Tierney's ADR practice is ranked #1 among all Arizona law firms by Ranking Arizona for 2020 - our fourth consecutive top ranking in the ADR category


E-mediation at Sacks Tierney
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Mediation and Arbitration

Arbitration and mediation are familiar ground for Sacks Tierney's veteran litigation attorneys, including members of the American Arbitration Association (AAA) commercial and construction arbitration panels.

See also: The Benefits of E-Mediation at Sacks Tierney


Arbitrators and mediators Sharon Shively, Greg Gillis and David Tierney

Arbitrators and mediators Sharon Shively, Greg Gillis and David Tierney

State-of-the-Art Conference Center

Litigation attorneys and their clients enjoy our new state-of-the-art 3,500-square-foot conference center, fully equipped with audio, video and network technology, and designed for the shuttle diplomacy required for a negotiated resolution.



Matter-Specific Knowledge and Experience

Sacks Tierney arbitrators are experienced in matters involving construction law, commercial law, creditors' rights, medical practice disputes, real estate valuations, contract clause disputes, and other important areas. Our attorneys serve as sole arbitrators, members of three-arbitrator AAA panels, and as settlement conference judges for State Court proceedings.

  • David Tierney is a past chair of the State Bar’s ADR Section and in four separate years has ranked among Super Lawyers’ top 50 Arizona attorneys. A veteran litigator, he is experienced in mediating and arbitrating a broad range of matters. David serves on AAA’s Commercial and Construction arbitration panels and Construction Mediation Panel. He and has been listed in The Best Lawyers in America® since 2006.

  • Sharon Shively, a Super Lawyers selectee and Best Lawyers honoree, frequently serves as a mediator and arbitrator in complex, multi-party matters. Sharon is a member of two of AAA’s top arbitration panels – Commercial and Construction – as well as the AAA Construction Mediation Panel. She is experienced in matters involving construction, creditors’ rights, real estate and general commercial disputes.

  • Greg Gillis has nearly 30 years of trial experience in a wide variety of construction disputes and commercial litigation matters. He has extensive experience as a neutral in mediating construction and commercial disputes. Greg is a member of AAA's commercial and construction panels of arbitrators and mediators. In addition to his AAA experience, Greg serves as a Judge Pro Tempore for Maricopa County Superior Court, conducting settlement conferences involving a wide variety of civil matters. He has received the Martindale Hubbell AV Preeminent® rating and has been a Best Lawyers in America® honoree since 2012 and a Super Lawyers selectee since 2014.


Arbitrator Alert: Awarding of Attorney’s Fees in Implied Warranty Cases,” David Tierney, August 2017

Trends in Arbitration and Mediation Case Law, Local and National,” David Tierney, August 2016

“The Litany of Dispute Resolution Options Can Be Confusing,” Greg Gillis, Scottsdale Airpark News, July 2016

Arbitration in Arizona: Changes Have Arrived,” David Tierney, March 2013

“Arbitration in Arizona: Changes Are Coming,” David Tierney, September 2010


“A Model Mediation Settlement Agreement (with Forms)” (Greg Gillis, panel moderator), State Bar of Arizona, ADR Section, January 2019

“Drafting Effective Arbitration Submission Agreements” (David Tierney, panelist), State Bar of Arizona ADR Section, September 2018

“Different Approaches to Dispute Resolution” (Greg Gillis, panel mediator, and David Tierney, panelist), State Bar of Arizona Annual Convention, June 2018

“ADR Talks” (David Tierney, panelist), State Bar of Arizona Annual Convention, June 2018

“ABCs of ADR” (Greg Gillis), Arizona Builders Alliance, October 2017; Southwest Business Credit Services, Legal Insights Educational Series, March 2017

“Private Arbitration Update” (David Tierney, co-presenter), American Arbitration Association, November 2016

“ADR Talks” (David Tierney, panelist), State Bar of Arizona Annual Convention, June 2016

“Arbitration and Mediation ‘Nuts and Bolts’ for Owners and Contractors” (David Tierney), Lorman Education Services, March 2010

“Mediation vs. Arbitration – Trends in Alternative Dispute Resolution in Arizona” (David Tierney), Lorman Education Services, March 2009