AZBio Board of Directors

David A. Dexter

General Manager, Joint Ventures, for the Quest Diagnostics Operations in Arizona

President & CEO for Sonora Quest Laboratories, LLC

President & CEO for Laboratory Sciences of Arizona, LLC

David A. Dexter is General Manager, Joint Ventures, for the Quest Diagnostics Operations in Arizona, serving as President & CEO for Sonora Quest Laboratories LLC, a joint venture between Quest Diagnostics (a Fortune 500 company) and Banner Health (the largest non-secular health delivery system in the US), and as President & CEO for Laboratory Sciences of Arizona LLC, which provides management oversight and strategic direction for hospital, rapid response, and commercial laboratories that support Banner Health Hospitals, Academic Medical Centers and Cancer Centers across the state of Arizona and five western states (California, Colorado, Nebraska, Nevada, and Wyoming).
Together, Sonora Quest Laboratories and Laboratory Sciences of Arizona make up one of the largest integrated laboratory networks in the nation, with more than 3,900 employees serving the entire continuum of healthcare.

Under Dexter’s leadership, Sonora Quest Laboratories recognitions have included:

  • 2025 ‘#1 Bioscience Company in Arizona’ by Ranking Arizona
  • 2024 ‘Top 40 Most Admired Companies in Arizona’ (2011–2019, 2021, 2024) by Az Business Magazine and BestCompaniesAZ
  • 2022 ‘100 Best Arizona Companies Best of the Stars’ by BestCompaniesAZ
  • 2021 ‘#1 Bioscience Company in Arizona’ for 10 consecutive years (2012–2021) by Ranking Arizona
  • 2017 ’IMPACT Award Exceptional Innovator’ for large businesses by Greater Phoenix Chamber of Commerce
  • 2017 ‘Corporate Philanthropy Award Community Impact’ for Arizona large companies by The Business Journal
  • 2011 ‘Business Ethics Award’ recipient by Better Business Bureau of Greater Arizona

Additionally, Dexter has been recognized personally for his leadership, including:

  • 2025 ‘Jon W. McGarity Arizona Bioscience Leader of the Year’ by Arizona Bioindustry Association (AZBio)
  • 2024 ‘National Sword of Hope Award’ by the American Cancer Society
  • 2023 ‘St. George National Award for Outstanding Volunteerism and Leadership’ by the American Cancer Society
  • 2022 ‘Most Admired Leader’ by Phoenix Business Journal
  • 2021 ‘Top 5 Bioscience AZ Business Leaders’ by AZ Big Media
  • 2020 ‘Top 3 Technology Leaders in Arizona’ by Arizona Capitol Times
  • 2019 ‘10 Most Transformational Leaders in Business’ by Beyond Exclamation
  • 2019 ‘AZ Business Leaders’ by AZ Big Media

Dexter is a Certified Six Sigma Green Belt. He serves on the Arizona Chamber of Commerce and Industry Board of Directors, the AZBio (Arizona Bioindustry Association) Board of Directors, Greater Phoenix Chamber Leadership Health Sector Task Force, and Arizona’s Bioscience Roadmap Steering Committee. Dexter also serves on the Breakthrough T1D (formerly JDRF) Board of Chancellors and is the chairman of the American Cancer Society’s CEOs Against Cancer (Arizona) and a member of the CEOs Against Cancer Executive Circle (national).