He is a founding member of alternative rock band Camper Van Beethoven.

In addition to co-founding Camper Van Beethoven, Krummenacher is also a co-founder of CVB offshoot Monks of Doom, and The Third Mind (with Dave Alvin, David Immerglück, Michael Jerome and Jesse Sykes).

He has also worked as a member of the Portland based band Eyelids, Two Heads (with John Moremen, Willie Aron and DJ Bonebrake of X), and Camper Van Chadbourne.

As a recording artist, Krummenacher has been active for more than 30 years and has appeared live and in the studio with numerous projects including Cracker, M. Ward, The Illustrious Ancestors (with John Kruth), Pat Thomas' Mushroom and McCabe and Mrs. Miller, a duo formed in 2008 with Alison Faith Levy of The Loud Family.

His tenth solo album excluding compilations is, Silver Smoke of Dreams, released on October 15, 2021.