Michael J. Hayes, Sr.

Of Counsel


Email E-Mail
V-Card v-card
872.529.5038 primary
Mr. Hayes is one of the leading commercial and consumer law litigation practitioners in the area.

Additionally, he has developed a nationally recognized skill in representing businesses involved in a variety of governmental regulatory issues. He has represented business clients in a wide range of actions brought by state, federal and local regulations. He also has substantial experience in representing national businesses in multi-state and multi-jurisdictional disputes. During his 40 years of practice Mr. Hayes has assisted clients with matters in every level of the state and federal judiciary and in a wide range of administrative tribunals, including the United States Supreme Court and the Illinois Supreme Court. Mr. Hayes has also advised clients on significant regulatory compliance issues and he has conducted internal investigations for regulated enterprises.

Prior to joining Ryan Law Mr. Hayes was a partner in the Chicago office of a global law firm. Mr. Hayes was also a partner in a large regional law firm where he served as Chair of the Litigation Department and on the firm’s Management Committee. Before entering the private practice of law Mr. Hayes served for over 16 years in the Office of the Attorney General for the State of Illinois. Mr. Hayes served initially as an Assistant Attorney General in the civil trial division and rose through the ranks to First Assistant Attorney General and then to the Deputy Attorney General positions. As Deputy Attorney General, Mr. Hayes supervised the day-to-day operations of the State’s legal business on a statewide basis. During his tenure in the Attorney General’s office he was an active participant with the National Association of Attorneys General.

Mr. Hayes has also served as a Special Cook County State’s Attorney representing various Cook County officials. He has also been engaged to represent the City of Chicago and the Chicago Park District.


Of Counsel, Ryan Law Firm, LLP, Chicago office

  • Represents clients in complex commercial and governmental enforcement actions. Provides legal advice and serves as a client advocate and liaison for client litigation and governmental issues, including tax issues within state, local and federal agencies.

K&L Gates LLP (formerly Bell Boyd & Lloyd)

  • Government Regulatory and Complex Commercial Litigation Attorney

Gardner, Carton & Douglas

  • Government Regulatory and Complex Commercial Litigation Attorney

Public Sector

Mr. Hayes worked in the Illinois Attorney General’s Office for almost 17 years and held the following positions:

  • Deputy Attorney General
  • First Assistant Attorney General
  • Director of Advocacy
  • Chief, General Law Division
  • Assistant Attorney General

City Club of Chicago
Fenwick Bar Association

Juris Doctor Degree, cum laude, DePaul University School of Law

Bachelor of Science Degree, Political Science, Loyola University