Patrick "Pat" Derdenger

Robert C. Ashley is a top attorney recognized by Best Lawyers in the practice area(s) of Insurance Law, Litigation - Insurance and Product Liability Litigation - Defendants. Robert C., who practices law in Phoenix, Arizona, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Robert C. is held by other top lawyers in the same geographic and legal practice area.

Doug John’s law practice focuses on tax controversy and state and local taxation, with an emphasis on property tax counseling and litigation. A senior partner in the firm and a Best Lawyers in America honoree, Doug works with individuals and companies to navigate Arizona’s and Nevada’s complex state and local tax systems in order to minimize their income tax, sales and use tax, and property tax liability. Over the past six years, Doug has reduced his clients’ property ...

Appeals Eric regularly handles high-profile appeals and issue litigation. He has argued major cases before the Ninth Circuit, Arizona Supreme Court, and Arizona Court of Appeals. Eric is listed in Benchmark Litigation’s 40 & Under Hot List, Best Lawyers, and Southwest Super Lawyers for appeals. Before joining private practice, Eric clerked on the U.S. Court of Appeals for the D.C. Circuit. He currently serves as a Ninth Circuit Appellate Lawyer Representative and as Chair Elect for ...

Mr. Nussbaum’s areas of practice include complex bankruptcy law, real estate, construction, and contract law. Mr. Nussbaum is a certified specialist in bankruptcy law by the Arizona Board of Legal Specialization and is also certified specialist in business bankruptcy law by the American Board of Certification. Mr. Nussbaum is an AV-Preeminent rated attorney and received his Bachelor of Arts degree, cum laude, from Arizona State University and his law degree from the Sandra Day O’C...

Theresa’s practice has been spent in fast-paced jury trials, employment and fair housing litigation, and appellate work. In her criminal practice, Theresa handled cases involving fraudulent schemes, tax fraud, real estate fraud, and racketeering. Theresa is a regular presenter to lawyers and the community on topics including Civil Rights, Harassment Free Work Environments, and the Rules of Evidence. Before joining Osborn Maledon, Theresa served as Section Chief Counsel for the Arizona A...

Phoenix business and real estate attorney Jim Valletta practices in the areas of real estate transactions, commercial transactions, business litigation and real estate litigation. Jim is a Best Lawyers in America® honoree whose transaction practice involves negotiating, preparing, and analyzing various types of commercial real estate transactions, including purchase agreements, development agreements, title, survey, financing and leasing in connection with industrial, office, retail, apar...

William M. Demlong is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation, Construction Law, Insurance Law and Litigation - Insurance. William M., who practices law in Phoenix, Arizona, has been recognized since 2017. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which William M. is held by other top lawyers in the same geographic and legal practice area.

Kenneth ("Ken") Januszewski practices in all areas of Construction-related and General Liability litigation and serves as the CD-GL Practice Group Chair for Nevada and New Mexico claims. He has served as lead counsel for construction industry clients in multi-million dollar residential and commercial litigation matters for clients including numerous developers, general contractors and subcontractors in complex litigation matters. Ken has for years provided coverage analysis for multiple carri...

Erin F. Dunlap is a top attorney recognized by Best Lawyers in the practice area(s) of Administrative / Regulatory Law and Health Care Law. Erin F., who practices law in Phoenix, Arizona, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Erin F. is held by other top lawyers in the same geographic and legal practice area.

Don practices exclusively in the area of employment and labor law. He counsels and represents employers in such matters as employment discrimination and sexual harassment claims, wrongful discharge claims, breach of contract claims, wage and hour disputes, arbitrations, unfair labor practice charges, employee hiring, discipline, and discharge procedures, drug and alcohol testing matters, non-competition disputes, labor relations issues and miscellaneous employment policy matters. Don has been...