A member of the Minnesota Democratic–Farmer–Labor Party (DFL), he represented District 43, which includes parts of Ramsey and Washington counties in the northeastern Twin Cities metropolitan area.

Wiger graduated magna cum laude from Hamline University in Saint Paul in 1974 and earned his J.D.

He is a former chair and member of the Ramsey County Soil and Water Conservation District.

As of 2021, he serves on the following committees:[2] His special legislative concerns include education, economic development, the environment, and water sustainability.

He was also founding chair of the East Communities Youth Service Bureau, and served as a director for Northeast Metropolitan Intermediate School District 916.