He is the creator, showrunner, and executive producer of the animated television series She-Ra and the Princesses of Power, which ran from 2018 to 2020.

He is also known for the science fantasy graphic novel Nimona, as co-writer of the comic series Lumberjanes, and The Fire Never Goes Out, his autobiographical collection.

[6][7] In a 2023 interview, Stevenson mentioned Pooh's Grand Adventure: The Search for Christopher Robin (1997), The Prince of Egypt (1998), Star Wars: Attack of the Clones (2002), The Lord of the Rings films, and Project Runway as influences in his childhood and adolescence.

[9][7] While there, Stevenson gained fame as a fan artist under the name "gingerhaze" for his "hipster Lord of the Rings" characters.

[9] For his work on Nimona, Stevenson won Slate Magazine's 2012 Cartoonist Studio Prize for Best Web Comic of the Year[12] and the 2016 Eisner Award for Best Graphic Album: Reprint.

Stevenson was also named a 2015 National Book Award Finalist for the graphic novel version of Nimona.

[13] While in school, Stevenson did freelance illustration for Random House, St. Martin's Press, and Label Magazine.

[15] Stevenson was part of the writing team of Disney's animated series Wander Over Yonder, beginning with the second season in 2015.

In 2021, the series was tied with First Day when it won the GLAAD Media Award for Outstanding Kids and Family Programming.

[49][50] On February 4, 2022, Stevenson posted a fan comic of The Book of Boba Fett entitled "This Place Was Home" on Twitter, which received a positive critical reception.

[51] In a later interview, Stevenson noted that at a young age, Wesell created a huge impression on him, noting he latched onto Zam because she was a shapeshifter, causing him to come up with a version of the story when Zam lived, "became the main character" in a "whole parallel world" that Stevenson constructed.

[55] Stevenson also noted he was working on an unannounced "two book series of novels" based on stories predating Nimona, which were originally written in his teenage years.

"[56] In an interview with the magazine, Stevenson said he was entering a "new creative phase" in his life amid "turbulence of late-stage capitalism".

[65] In August 2021, Stevenson changed his first name to ND, as noted by CBR, Out, ComicsBeat, Xtra Magazine, and Bleeding Cool.

He described his journey to self-acceptance, his "battle against the gender essentialism of [his] Evangelical upbringing", and stated that he had become an atheist by age 23.