Representative John Spiros was first elected to the Wisconsin State Assembly in 2012 (re-elected in 2014 & 2016). He currently serves on the Assembly Committees of: Criminal Justice and Public Safety (Chairman), Transportation (Chairman), International Affairs and Commerce, Labor, Mental Health, and the Joint Committee on Legislative Council. During his first two terms, he also served on the Governor's Transportation Projects Commission.

Prior to being elected to the State Assembly, John served as a City Alderman in Marshfield (elected in 2005; served through 2013). He is a member of the Marathon County Farm Bureau, a member of the Marshfield Elks Lodge 665, and past member of the Marshfield Rotary Club. He also works in the private sector as the Vice President of Safety and Claims Management for a major transportation company in Marshfield. In 2014 he was elected as President of the Transportation Industry Defense Association.

John is a veteran of the United States Air Force, having proudly served for 6 years. As a member of an elite security squad at Offutt Air Force Base Nebraska, he was tasked with protecting the 26 generals and the command center for the Strategic Air Command. After the US Air Force, he served as a police officer for the cities of McKinney and Rowlett, Texas.

John is married to Rebecca, who is a nurse at the Marshfield Clinic. Together they have 5 adult children and 3 grandchildren. They have a son in college, a son employed in private industry, a daughter who is in education teaching children with cognitive disabilities, a son who is self-employed in construction, and a daughter who is employed in the business sector.