Osborn Maledon PA

30 Best Lawyers awards

Osborn Maledon PA logo

Awarded Practice Areas

Bet-the-Company Litigation Commercial Litigation Litigation - Construction Litigation - Intellectual Property Litigation - Mergers and Acquisitions Litigation - Securities

Biography

Valued by clients for his ability to analyze and respond to complicated commercial litigation, David has built a strong practice representing Fortune 50 companies in state and federal courts. He focuses on a wide range of complex litigation, including securities and intellectual property litigation, class action claims, as well as other large commercial disputes. He has provided regular counsel to large public companies facing lawsuits in Arizona who value his ability to advocate both in oral and written arguments.

David’s practice includes representation of both local and national companies and their officers and directors, naturally adapting his experience across industries, including aerospace, telecommunications, and healthcare. He graduated with honors from Georgetown University Law School and completed mediation training at the Strauss Institute for Dispute Resolution at Pepperdine University School of Law. He is a past President of the Federal Bar Association and Lawyer Representative to the Ninth Circuit Judicial Conference. He currently serves on the Arizona State Bar Board of Governors and the Board of Directors at the Arizona Foundation for Legal Services and Education. He has been recognized in America’s Leading Lawyers for Business by Chambers USA and has been named multiple times as Lawyer of the Year for Phoenix in Best Lawyers® and as a Top 100 Lawyer in Arizona by AZ Business Magazine.

Osborn Maledon PA

30 Best Lawyers awards

Osborn Maledon PA logo

Overview

  • Georgetown University, J.D., graduated 1983
  • University of Pennsylvania, B.A., graduated 1979

  • Arizona, 1984
  • District of Columbia, 1985

  • U.S. Supreme Court
  • U.S. Tax Court
  • U.S. Court of Appeals, Ninth Circuit
  • U.S. District Court, District of Arizona
  • Arizona Supreme Court
  • U.S. Court of Appeals, District of Columbia Circuit

  • United States District Court
  • Arizona, 1984
  • District of Columbia, 1985
  • Georgetown University, J.D., graduated 1983
  • University of Pennsylvania, B.A., graduated 1979
  • U.S. Supreme Court
  • U.S. Tax Court
  • U.S. Court of Appeals, Ninth Circuit
  • U.S. District Court, District of Arizona
  • Arizona Supreme Court
  • U.S. Court of Appeals, District of Columbia Circuit
  • United States District Court

Client Testimonials

David is a great lawyer. He is very smart, very dedicated to his clients and their success, and he is very easy to work with. He is one of the first lawyers we think of for litigation matters.

David Rosenbaum is an outstanding litigation attorney that has consistently done an outstanding job of representing our company.

David is everything that you would want in litigation counsel. His vast intellectual prowess and experience allows him to cost-consciously maneuver through all types of litigation. David's judgment is excellent and his ability to communicate intelligently and concisely, both in court and with his clients, make him a real go-to lawyer.

Kristen Weathersby (Cox Communications)

David is an outstanding trial lawyer with a great business sense. He is very experienced in the federal courts in the Ninth Circuit, as well as in all Arizona tribunals. David has hired and developed outstanding litigation associates, and is not afraid to delegate real work to them, unlike some partners who are fearful of delegating to junior lawyers. He's incredibly responsive any time of the day or night, even though he maintains a very busy schedule and is often out of the office in depositions, trial appearances, hearings, etc.

Robin Sangston (Cox Communications, Inc.)

Awards & Focus

Lawyer of the Year Badge - 2024 - Litigation - Intellectual Property Lawyer of the Year Badge - 2024 - Litigation - Securities Lawyer of the Year Badge - 2021 - Litigation - Securities Lawyer of the Year Badge - 2020 - Litigation - Intellectual Property Lawyer of the Year Badge - 2016 - Bet-the-Company Litigation Lawyer of the Year Badge - 2014 - Litigation - Securities Lawyer of the Year Badge - 2011 - Bet-the-Company Litigation
Named "Lawyer of the Year" by Best Lawyers® for:
  • Litigation - Intellectual Property, Phoenix (2024)
  • Litigation - Securities, Phoenix (2024)
  • Litigation - Securities, Phoenix (2021)
  • Litigation - Intellectual Property, Phoenix (2020)
  • Bet-the-Company Litigation, Phoenix (2016)
  • Litigation - Securities, Phoenix (2014)
  • Bet-the-Company Litigation, Phoenix (2011)
Recognized in The Best Lawyers in America® 2026 for work in:
  • Bet-the-Company Litigation
  • Commercial Litigation
  • Litigation - Construction
  • Litigation - Intellectual Property
  • Litigation - Mergers and Acquisitions
  • Litigation - Securities
Special Focus:
  • Civil Litigation
  • Class Actions
  • Commercial Disputes
  • Complex Litigation
  • COVID-19
  • Defendants
  • Intellectual Property
  • SEC Enforcement
  • Stockholders' Suits
Awards:
  • Thomson Reuters, Stand-Out Lawyer, 2025

  • Chambers USA, America’s Leading Lawyers for Business, Litigation: General Commercial, 2005-2025

  • Best Lawyers®, Bet-the-Company Litigation; Commercial Litigation; Construction Litigation; Intellectual Property Litigation; Mergers & Acquisitions Litigation; Securities Litigation, 2005-2026

  • AZ Business Magazine, “Top 100 Lawyers in Arizona”, 2020, 2021, 2024

  • Lawdragon’s “100 Lawyers You Need to Know in Securities Litigation”, 2008

  • Benchmark Litigation Star, 2024-2025

  • Benchmark Litigation, Arizona “Local Litigation Star”, 2010-2022

  • Southwest Super Lawyers, “Top 50 Arizona Attorneys”, 2010, 2012, 2014-2024

  • Southwest Super Lawyers in Business Litigation, Securities Litigation, 2007-2025

  • PHOENIX magazine, Top Lawyers, Commercial Litigation, 2025

  • Judicial Branch Distinguished Service Award, Awarded by Arizona Supreme Court Chief Justice Rebecca Berch for Outstanding Service and Contribution to the Arizona Judicial Branch, 2011

  • BTI Client Service All-Star Team, 2011

  • Arizona’s Finest Lawyers

  • Judge Learned Hand Award for Community Service, Arizona Chapter of American Jewish Committee, 2006

  • President’s Award, State Bar of Arizona, 2006

  • Top 50 Pro Bono Attorneys, 2001

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