O'Connor & Thomas, P.C.
A. John Arenz

(563) 557-8400

John Arenz was born in Dubuque, Iowa. John graduated magna cum laude from Marquette University in 1975, where he was a member of the Phi Beta Kappa honor society. He obtained his law degree, cum laude, from Georgetown University in 1978. While at Georgetown, John was a member of the Student Editorial Board of The Tax Lawyer. He returned to Dubuque after law school and was admitted to the Iowa Bar in 1978, joining our firm that same year. He was later admitted to the Wisconsin Bar in 1985. John is admitted to practice before the U.S. District Court for the Northern and Southern Districts of Iowa, the Western District of Wisconsin, and the United States Supreme Court. He is currently a member of the American, Iowa State, and Dubuque County Bar Associations, as well as the State Bar of Wisconsin. John is a member of the American Association for Justice and the Iowa Association for Justice. John is certified as a Civil Trial Advocate by the National Board of Trial Advocacy. His general practice includes civil litigation, personal injury, workers compensation, and trial law.


Civil Trial Advocate, National Board of Trial Advocacy

Honors & Awards

2016; Super Lawyer - PI General:Defense

Professional Associations & Memberships

Iowa State Bar Association
Iowa State Bar Association, Litigation Section
American Bar Association
American Bar Association, Litigation Section
State Bar of Wisconsin
State Bar of Wisconsin, Litigation Section
The American Association for Justice
The Iowa Association for Justice
Iowa State Grievance Commission
Division Member
Iowa Title Guaranty Association
Dubuque County Bar Association
The National Trial Lawyers Top 100 Trial Lawyers, February 1, 2011 - Present


Trial Law, Personal Injury, Litigation, Workers' Compensation


Georgetown University Law Center, Washington, District of Columbia, 1978
Honors: cum laude
Law Review: Student Editorial Board, The Tax Lawyer, 1977 - 1978

Marquette University, Milwaukee, Wisconsin, 1975
Honors: magna cum laude
Honors: Phi Beta Kappa

Bar Admissions

Iowa, 1978
Wisconsin, 1985
U.S. District Court Northern District of Iowa
U.S. District Court Southern District of Iowa
U.S. District Court Western District of Wisconsin
U.S. Supreme Court