Karl is a featured artist on Imaginary Chicago Records.
Karl is a Velvet Strings Bass Artist.
For both classical and jazz, he plays the Garbo Set — made in Switzerland.
Karl is a Music Man Bass Artist.
He plays the Reflex Bass 5 electric bass with Ernie Ball Slinky Bass 5 strings exclusively.
When playing electric bass, Karl only trusts and uses Italia Leather Straps.
Listen to Karl's Public Radio interview about Portrait of Jack Johnson.
Features a live performance of the title track by Karl's jazz trio.
Listen to Karl's Public Radio interview about Fred Anderson.
Features a live performance of "Mr. Anderson" — Karl's solo bass tribute to the legendary Chicago saxophonist.
Listen to Karl's Public Radio essay on discrimination in the jazz world.
Read "At Once Old-Timey and Avant-Garde": The Innovation and Influence of Wilbur Ware — Karl's book on the legendary Chicago bassist.
Read Karl's articles and ringside reports on boxing at Boxing World.
Read Karl's articles and interviews on Norse myth at The Norse Mythology Blog.