Joseph M. Lehman

Joseph M. Lehman is a trial and appellate attorney serving clients across Illinois. He represents individuals in civil and criminal litigation, with a strong focus on First Amendment and constitutional matters. He handles appeals in all five Illinois state appellate districts and appears before military Courts of Criminal Appeal. Through careful research, clear writing, and confident courtroom advocacy, he works to protect rights, challenge unfair decisions, and pursue just outcomes for every client. He values preparation and strategic thinking skills. His practice at Law Offices of Donald J. Cosley focuses on Appellate Practice, Civil & Criminal Litigation, Family Law, Civil Rights, College & University Student Disciplinary Proceedings, First Amendment Litigation, Military Appeals, and State Administrative Law.

Joseph Michael Lehman earned his B.A. in English & Minor in Legal Studies from the University of Illinois at Urbana-Champaign in 2021. He later received his J.D., magna cum laude, from the University of Illinois College of Law in 2025. During law school, he received multiple awards for trial advocacy and advanced legal research. His academic training built a strong foundation in legal writing, courtroom strategy, and detailed statutory analysis. He graduated with honors and academic distinction among his law peers.

Mr. Lehman served as a law clerk for Judge Colleen Reardon Daly of the Circuit Court of Cook County before joining the Cosley Law Office. As a 711 law student attorney, he represented clients through the First Amendment Clinic, the Office of Student Legal Services, and the Illinois State’s Attorneys Appellate Prosecutor. He also worked with the U.S. Air Force Appellate Defense Division, gaining hands-on experience in complex appellate matters. These roles strengthened his commitment to effective client advocacy.

Joseph M. Lehman represents clients in appellate practice, civil and criminal litigation, civil rights claims, and administrative proceedings, including DCFS and FOID appeals today. He also assists college students in disciplinary matters and handles military appeals. Clients rely on his thorough preparation and clear communication during difficult disputes. By combining courtroom skill with detailed legal research, he helps individuals protect their freedoms, defend their reputations, and seek fair resolutions in challenging cases. He remains dedicated to justice and client service statewide.

Law Office Affiliations

• Attorney, Law Offices of Donald J. Cosley
• Member, Illinois Prosecutors Bar Association
• Member, Illinois State Bar Association
• Member, Champaign County Bar Association
• Member, Northwest Suburban Bar Association
• Member, Kane County Bar Association
• Member, Federalist Society

Licensed State

• Illinois

Education

• University of Illinois College of Law
  Juris Doctor (JD)
• University of Illinois at Urbana-Champaign
  BA in English

Awards & Badges