Kevin Rutmanis is an American bass guitarist. He is of Latvian descent. Before getting into music, he was a student teacher. In late 1985, along with his younger brother Sandris Rutmanis, Thor Eisentrager, and then Jayhawks drummer Norm Rogers, he started the band The Cows. After the dissolution of The Cows, Rutmanis was the bass guitar player for The Melvins from 1998 to 2005. He was also the bass guitarist in the supergroup Tomahawk featuring Mike Patton. Kevin played bass on Tomahawk's first two long play releases, titled Tomahawk and Mit Gas, and played for two world tours supporting those albums. He has since recorded with Hepa-Titus.