[2] Critics have compared his double bass approach to those of Malachi Favors, Henry Grimes, Charlie Haden,[3] Charles Mingus,[4] and Sirone.
Although not a member of the Association for the Advancement of Creative Musicians, Seigfried has performed with members from all generations of the Chicago organization, including Fred Anderson, Gerald Donovan / Ajaramu, David Boykin, Ernest Dawkins, Fred Hopkins, Aaron Getsug, George Lewis, Nicole Mitchell, Roscoe Mitchell, Jeff Parker, Avreeayl Ra, and Isaiah Spencer.
In the classical world, Seigfried is member of the Chicago Sinfonietta and performed with them for collaborations with Poi Dog Pondering and Muddy Waters guitarist John Primer.
He is Principal Bassist of the Chicago Sinfonietta Chamber Ensemble and has been featured in their collaborations with Adler Planetarium & Astronomy Museum, Shedd Aquarium, and Joffrey Ballet.
As Principal Bassist of the Peoria Symphony Orchestra, he has led the bass section behind soloists Emanuel Ax, Joshua Bell, Evelyn Glennie, Hilary Hahn, Sharon Isbin, Yo-Yo Ma, Mark O'Connor, and Itzhak Perlman.
[10] He is a member of the space rock supergroup Spirits Burning, which features members of Hawkwind, Blue Öyster Cult, Citizen Fish, Gong, Jefferson Starship, Psychic TV, Soft Machine, The Tubes, and Van der Graaf Generator; their psychedelic cover of "Ace of Spades" (featuring Seigfried on upright bass with Hawkwind vocalist Bridget Wishart) was included on the 2008 Motörhead tribute album, Sheep in Wolves' Clothing.
[13] Portrait of Jack Johnson features "The Boxing Bassist Suite," which includes musical portraits of three twentieth-century boxing champions who were also jazz bassists: Jack Johnson, Archie Moore, and Ezzard Charles; the album cover was painted by British comic book artist Boo Cook and designed by American comic book graphic company Comicraft.
Seigfried holds a doctorate in Double Bass Performance, and his treatise on Wilbur Ware is the only scholarly work on the African-American Chicago bassist.