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Michael W. Sillyman


Michael practices primarily in the area of complex commercial litigation including defense of business torts, defamation, contract claims, securities fraud and interference claims as well as insurance coverage litigation. He has an extensive practice in administrative law and has represented numerous state licensing agencies in revocation and disciplinary proceedings, and public record requests, and several government entities including the State of Arizona and various counties and municipalities in matters involving the representation of elected and appointed officials, enforcement of development fees, public records requests, open meetings laws and government pension related litigation.

Michael also represents employers, both private and governmental, in a variety of employment matters ranging from sexual and racial harassment claims to retaliation and wrongful termination and the enforcement of non-compete provisions. He practices before state and federal courts as well as before the Equal Employment Opportunity Commission and the Arizona Civil Rights Division.

Michael's healthcare experience includes managed care, URAC accreditation and compliance, urgent and emergency care, Utilization Management, financial compensation and bonuses, pre-authorization and medical necessity. 

His practice also includes arbitrations for FINRA and the National Futures Association and he serves as an AAA neutral.

Michael has been a member of the White Mountain Apache Bar and authorized to practice law before its Tribal Court for over 15 years. 

He has represented the State of Arizona, the County of Maricopa, the municipalities of Phoenix, Mesa, Tempe, Chandler and Maricopa and numerous of their agencies in such matters as:

  • § 1983 claims
  • Employee disciplinary matters
  • Wrongful death actions
  • Data Breach
  • License disciplinary actions
  • Business torts
  • Discrimination
  • Breach of contracts
  • Open meeting laws 
  • Public records laws 
Government Service
  • State of Arizona, Assistant Attorney General, 1977-1984

  • Obtaining a $6 million judgment on a personal guaranty.
  • Defending a statewide elected official in a RICO and intentional interference lawsuit claiming damages in excess of $750 million.
  • Defending a sexual harassment and discrimination claim brought by five female employees of the State of Arizona.
  • Bringing suit against an Arizona Indian tribe for violations of a State Gaming Compact.
  • Representing the Arizona Medical Board in physician disciplinary matters.
  • Representing 80 former officers and directors of a bankrupt religious foundation in several lawsuits claiming damages in excess of $350 million.
  • Defending a breach of contract claim alleging damages in excess of $100 million.
  • Counseling clients on data breaches affecting over 50,000 individuals.
  • Obtaining decisions in over 20 Appellate cases in the Arizona Court of Appeals, the Arizona Supreme Court and the Ninth Circuit Court of Appeals. 
  • Pursuing disciplinary actions against 50+ employees for misuse of company computer systems. 
  • Healthcare litigation involving representation of a managed care heath plan under the Affordable Care Act.
Commercial Litigation
  • Defending a county against developer claims for breach of contract.
  • Defending and brought numerous lawsuits seeking injunctive relief.
  • Advising a client in regard to a data breach affecting over 50,000 individuals. 
Employment Law
  • Investigating a discrimination claim brought against a city manager.
  • Defending the State of Arizona in § 1983 claims.
  • Defending a municipality in claims involving disciplinary actions against more than 50 employees.
  • Representing a county merit board in regard to employee disciplinary matters.
  • Serving as a hearing officer in labor-related issues.
  • Representing numerous corporations on claims of sexual harassment and discrimination. 
Indian Law
  • Investigating embezzlement or misapplication of federal funds.
  • Investigating possible employee misconduct.
  • Investigating HUD allegations of wrongdoing.
  • Defending an election challenge.
  • Litigating Indian Gaming Compact violations.