Winning honorable mention in a "draw a monster" contest hosted by Ed "Big Daddy" Roth, for Drag Cartoons when he was in seventh grade reassured him that he was on the right path.

[6] While still in high school, Veitch and his brother Tom created the comic strip Crazymouse, which ran regularly in The Vermont Cynic.

He made his professional debut in 1972, illustrating the underground comix horror parody Two-Fisted Zombies published by Last Gasp and written by Tom.

[7] Studying under veteran cartoonists Joe Kubert, Ric Estrada and Dick Giordano, he was part of the school's first graduating class in 1978, along with his future long-time collaborators Stephen R. Bissette and John Totleben.

While still at school Veitch began his professional career in mainstream comics, contributing over a dozen short stories to DC’s combat title, Our Army at War.

With Moore and Bissette, Veitch collaborated on the original version of The Mirror of Love, published in a 1988 anthology by AARGH (Artists Against Rampant Government Homophobia).

Originally published as a six-issue comic book limited series, The One was an ambitious and bizarre fantasy-adventure involving monstrous superheroes, the Cold War, and spiritual evolution.

As Moore would later write: "The One ... is a kind of landmark; a pulling together of obsessions and ingenious storytelling ideas into a coherent whole ... Its revisionist superheroics, while conceived at roughly the same time, predate Watchmen and Dark Knight in terms of publication, as does its packaging.

In 1994 King Hell inaugurated a Rare Bit Fiends comic series, with contributions by Neil Gaiman, Dave Sim, Don Simpson, Moebius, Paul Pope, and others.

In 1998, with Steve Conley, he created the "online convention" site Comicon.com, a combination message board, news portal, and web host for comics creators.

In the early 2000s, Veitch became a regular artist on Moore's America's Best Comics line published by Wildstorm, co-creating and then illustrating the graphically innovative "Greyshirt" serial.

Reconciling with the company, Veitch scripted story arc for DC's relaunch of Aquaman (2003), and a mini-series reimagining DC-owned Charlton Comics character The Question as a self-trained urban shaman.

[9] In 2006, Vertigo published his 352-page graphic novel, Can't Get No, a psychedelic road narrative about a failed businessman finding himself after the World Trade Center attacks.

Eschewing dialogue, the novel juxtaposes Veitch's art with stream-of-consciousness free verse poetry loosely relating to plot developments.

On the tenth anniversary of the destruction of the World Trade Center, he wrote and penciled on The Big Lie,[9] a comic book in which the protagonist – a physicist widowed on September 11, 2001 – travels back in time to attempt to save her husband.

For McGraw Hill Education, Eureka Comics produced The Outliers, a three book series, pioneering the use of modern graphic novel storytelling techniques to teach math to middle schoolers.

[23] In 2020 Veitch was named Vermont’s official Cartoonist Laureate for his "singular career that includes groundbreaking genre work for the big superhero companies, his own creator-owned graphic novels, educational comics, and explorations into the subconscious."