[1][2] He is the creator, co-designer, and writer of Robbie Reyes Ghost Rider,[3] and the author of Peepo Choo, a manga series debuting in 2009 in Kodansha's Morning 2 monthly magazine.

[4][5] When Smith was five years old, he moved with his family to Buenos Aires, Argentina, where he studied at an international school, Asociación Escuelas Lincoln.

[6][7] Smith began his career in comics in 2005 and was living in Los Angeles when he wrote and drew his first three-volume graphic novel series, the semi-autobiographical MBQ.

As a result, in 2008 Smith moved to Tokyo to publish his second three-volume graphic novel series, Peepo Choo, one of the first manga titles created by a non-Japanese native and initially serialized by Kodansha for a Japanese audience before it was later released in English by Vertical Inc.[4][10] Smith worked four years in the Japanese market; when he returned to L.A. in 2012, he joined Nickelodeon's Teenage Mutant Ninja Turtles animated TV series, first in the storyboard department and then as a full-time character designer.

[12] From the start, Smith was given complete freedom to create the character's personality and background and the setting in which events in the series take place;[13] he also sketched the preliminary visual designs.