He is best known from the Fox show Fring where he played a mysterious mute child in the episode "Inner Child". He has also been on Law & Order: Special Victims Unit where he played Tate, the son of Leland Orser's character Kevin Walker. List appeared in Jack Ketchum's Offspring in 2009.
Spencer was born in Florida, but moved to New York at the age of 4. At the age of 12/13 he moved to Los Angeles. He began acting at an early age, both alone and also with his twin sister Peyton. List has appeared in over four hundred commercial advertisements in various formats for various companies.
List's younger brother Phoenix and twin sister Peytonare both actors and models. He is 1 minute younger than Peyton.
|2003||Law & Order: Special Victims Unit||Tate Walker||Television series (Episode "Coerced")|
|2004||One Life to Live||Ace||Television series|
|Spider-Man 2||Little Boy|
|2006||Haskett's Chance||Owen Haskett|
|2007||Saturday Night Live||Little Boy||"Angry Dog" segment|
|2009||The Wonder Pets||Giraffe||Television series (Episode "Job Well Done")|
|Sibling: Marcus Miller the Orphan Killer||Young Marcus Miller|
|Fringe||The Child||Television series (Episode "Inner Child")|
|2011||Bringing Up Bobby||Bobby|
|CSI: Miami||Troy Faber||Episode: "A Few Dead Men"|
|The Orphan Killer||Young Marcus|
|2012||iCarly||Lurvin||Television series (Episode "iBattle Chip")|
|2014||Black Dog, Red Dog||Gary||Post-production|
|Night Has Settled||Oliver Nicholas|
|A Wife's Worst Nightmare||AJ||Lifetime Film|
|2016||Bunk'd||Eric||Episode: "Luke's Back"|