In 2000, Tong worked on a graphic novel, The Architect with Mike Baron, which was eventually published online through Big Head Press in 2006. Tong moved to London in 2005, where from 2005 until 2010, he was the regular artist for Spectacular Spiderman UK. During this period he also worked on covers and artwork for Teenage Mutant Ninja Turtles, Masters of the Universe, Starship Troopers and The Batman Strikes.
In 2010, Tong completed the Tron: Betrayal graphic novel, a prequel comic to the movie,Tron: Legacy. In 2010, He undertook illustrating duties on Dynamite Entertainment 's comic adaptation of Robert Jordan 's Wheel of Time series. He also illustrated The Eye of the World: The Graphic Novel, Volume Two, Volume Four, and Volume Six published by Tor Books.
In 2012 and 2013, Tong illustrated three books for HarperCollins starring Batman and the Justice League.
In 2013 Tong provided the artwork for the graphic novel, The First Law: The Blade Itself, based on the series of novels by British author Joe Abercrombie.
In November of that year it was announced that Tong would be illustrating Disney's Zodiac Legacy, an illustrated novel created by Stan Lee and Stuart Moore, based on the Chinese zodiac. Book one named Convergence premiered in January 2015 and the second book, The Dragon’s Return was released on January 2016.