The same year he graduated from law school, Lundsten was hired by Bronson La Follette, then Wisconsin's Attorney General, to serve as an Assistant Attorney General in the Wisconsin Department of Justice.
At the Department of Justice, he was initially assigned to the Medicaid Fraud Control Unit.
[3] On October 31, 2000, Governor Tommy Thompson appointed Lundsten to the Wisconsin Court of Appeals to replace retiring Judge William Eich.
[4] Judge Lundsten was elected to a full term in 2001, defeating attorney Charlie Schutze, and was subsequently re-elected without opposition in 2007 and 2013.
In his contested 2001 race, he was endorsed by a broad coalition of Republicans and Democrats, including then Republican Governor Tommy Thompson and then Democratic State Attorney General Jim Doyle.