Koi Turnbull was born in Elmhurst, Queens New York. He spent most of his upbringing in New York, but in 1991 at the age of 13 he moved to Asheboro, North Carolina. In Asheboro, he spent six years learning about comics while working at a comic store.

In 1997 he moved back to New York in order to pursue a career in that industry, working on various background projects for Marvel artists Adam Pollina and Walter McDaniel.

In 2002, Turnbull moved back to Asheboro, North Carolina. That same year, Turnbull showed his art samples to Aspen MLT's Vice President of Publishing, Peter Steigerwald, and Executive Vice President, Frank Mastromauro, at the Wizard World Chicago convention. AFter being hired by Aspen, Turnbull moved to Santa Monica, California in 2003, working in their Marina Del Rey studio, working on multiple Fathom comic series.

Since Aspen, Turnbull has gone on to work for other publishers such as DC comics and Marvel Comics. He is currently working with Marvel Comics and a member of HeadHunta' Studios along with other industry members Nathan Massengill, Dave Wilkins, and Tony Washington.

Interior and cover art

• The 3-minute Sketchbook (2007) #1
• Aspen Seasons: Spring 2005 (2005) #1 #1(Aspen Exclusive) #1(Wizard World LA variant)
• Batgirl #11 and TPB vol.02
• Batman: Gotham Knights #12
• Black Panther collected edition, TPB vol.04, #23 and #24
• Detective Comics #756
• Ex Parte #1 and #2
• The Flash (1987) #237 - 'Superman's Cape
• Green Lantern (1990) Annual 09 - 'Mother of Heaven'
• Heroes (2006) #1 - 'Monsters'
• Shrugged #4

• Heroes (2007)
• HC vol. 01 (Alex Ross Cover) - 'Volume One'
• HC vol. 01 (Jim Lee Cover) - 'Volume One'
• TPB vol. 01 - 'Volume One'
• Justice Leagues Justice League of Arkham (2001) - #1 Justice Leagues Part IV: Taking Over the Asylum

• New Warriors (2007)
• TPB vol. 03 - 'Secret Invasion'
• #14 - 'Invaded: Part 1
• #15 - 'Invaded: Part 2'
• Nova (1999) - #5 - 'Lo, There Shall Come A Spider
• Outsiders Five of a Kind (2008) - TPB
• Outsiders Five of a Kind - Thunder/Martian Manhunter (2007) #1 - five of a Kind, Part 3: Bug-Eyed Monsters'
• Purgatori (2001) - #1 (Standard Cover) - 'Love Bites'
• Superman Confidential (2007) #6 - 'Welcome to Mer-Tropolis', #7 - 'Welcome to Mer-Tropolis, Conclusion'
• Superman Metropolis Secret Files and Origins (2000) - #1

• Terror, Inc. - Apocalypse Soon (2009)
• TPB
• 1 - 'A Long Time Coming'
• 2 - 'Snake in the grass'
• 3 - 'The Enemy of My Enemy is My Friendly Enemy'
• 4 - 'Sick? Or Sick and Tired?'
• Vamperotica (1993) - #12
• What If...? (1989) #112 - 'What If... Starring Ka-Zar: New York... ...The New Savage Land... ...No Escape!'
• Wolverine: Dangerous Games (2008) Premiere HC - 'Wolverine: Dangerous Games, TPB
• Wolverine: Killing Made Simple (2008) - #1
• Worlds of Aspen (2006) #1 - 'Say Hello To Aspen (...Kiani and Grace too!)'

• Fathom (2005)
• 0 TPB - 'Fathom Vol 2:
• 0 - 'Fathom Zero
• 0 (Cover B - Wizard World Los Angeles Exclusive) - 'B - Wizard World Los Angeles Variant'
• 0 (Cover C - Wizard World Los Angeles VIP Exclusive) - 'Fathom Zero'
• 1 - 'Poseidon Shrugged'
• 1 (Cover B - Direct Edition) - 'Poseidon Shrugged'
• 1 (Cover C - Wizard World Philadelphia Exclusive) - 'Poseidon Shrugged'
• 1 (Cover D - Wizard World Philadelphia Exclusive) - 'Poseidon Shrugged'
• 1 (Cover E - Wizard World Philadelphia VIP Exclusive) - 'Poseidon Shrugged'
• 2 - 'Illumination'
• 2 (Cover B - JayCompanyComics.com Exclusive) - 'Illumination'
• 3 - 'Illumination (Part II)'
• 3 (Cover B - Wizard World Chicago Exclusive) - 'Illumination (Part II)'
• 4 - 'Missing Persons'
• 4 (Cover B - Direct Edition (Blue)) - 'Missing Persons'
• 4 (Cover C - Direct Edition (Black)) - 'Missing Persons'
• 4 (Cover D - Direct Edition (Water)) - 'Missing Persons'
• 4 (Cover E - Armageddon Supanova Exclusive) - 'Missing Persons'
• 4 (Cover F - Wizard World Texas VIP Exclusive) - 'Missing Persons'
• 5 - 'Self Preservation'
• 6 - 'The Road to Damnation'
• 7 - 'Gut Check'
• 7 (Cover B - Wizard World Los Angeles Exclusive) - 'Gut Check'
• 8 - 'Reunited'
• 8 (Cover B - Wizard World Los Angeles Exclusive) - 'Reunited'
• 9 - 'Running Deep'
• 10 - 'Boiling Point'
• 10 (Cover B - Wizard World Chicago VIP Exclusive) - 'Boiling Point'
• 10 (Cover C - Wizard World Chicago Exclusive) - 'Boiling Point'
• 11 - 'Watershed'
• 11 (Cover B - Wizard World Texas Exclusive) - 'Watershed'
• Fathom cover Vol.2 #1,5-11

• Fathom Beginnings (2005)
• 1 - 'Paradise'
• 1 (Australia/New Zealand Exclusive Cover) - 'Paradise'

• Fathom: Cannon Hawke (2004)
• Prelude - 'Crossing over'
• Prelude (Wizard World East)
• Prelude (Wizard World East cover B)
• 1 - 'Beginnings'
• 0 - 'Coldspell'
• 0 (Dynamic Forces Cover) - 'Coldspell'
• 0 (San Diego Comicon 2004 Cover) - 'Coldspell'

• Fathom: Cannon Hawke: Dawn of War (2004)
• 1 - 'Perspective'
• 1 (Cover A) - 'Perspective'