Katherine Peterson's portfolio includes commercial interior design projects for various Firstar buildings including a 42-story building, trust and corporate offices, employee spaces, file storage, and more. It also includes projects for Lewis Center floors focusing on mutual funds, employee benefits, and work spaces. Additional projects include remodels and new construction for various Firstar bank locations over different eras as well as interior design work for the new addition to the Milwaukee Art Museum designed by Santiago Calatrava and Kahler Slater Architects.