He has illustrated stories for the Marvel Comics' series Clive Barker's Hellraiser, the Vertigo miniseries Faultlines and Alan Moore's song, "Hair of the Snake That Bit Me".
[4] Koeb spent 17 years in San Francisco as a freelance illustrator before moving to Chapel Hill, North Carolina, where he resides as of 2002.
In addition to the series, Koeb painted the 18-page story "For My Son", written by Frank Lovece, for Clive Barker's Hellraiser Summer Special #1 (1992).
[6] Other comics work includes pencil-and-ink art for writer Lee Marrs' six-issue miniseries Faultlines (May-Oct. 1997), published by DC Comics' Vertigo imprint; and the cover and writer Alan Moore's eight-page story "The Hair of the Snake That Bit Me" in Caliber Press' Negative Burn #17 (1995), reprinted in the 1998 Caliber one-shot Alan Moore's Songbook.
In late 2001, with the birth of his son Gabriel, and with fewer jobs coming in as the result of a downturn in the economy, Koeb focused on painting and earned a living primarily from teaching Photoshop and illustration classes at The Academy of Art, San Francisco.