Sergio Aragonés Domenech (born 6 September 1937,Sant Mateu, Castellón, Spain) is a cartoonist and writer best known for his contributions to Mad Magazine and creator of the comic book Groo the Wanderer.

Among his peers and fans, Aragonés is widely regarded as "the world's fastest cartoonist." The Comics Journal has described Aragonés as "one of the most prolific and brilliant cartoonists of his generation."Mad editor Al Feldstein said, "He could have drawn the whole magazine if we'd let him."

Born in Spain, Aragonés emigrated with his family to France, due to the Spanish Civil War, before settling in Mexico at age 6. Aragonés had a passion for art since early childhood. As one anecdote goes, Aragonés was once left alone in a room by his parents with a box of crayons. His parents returned sometime later to find that he had covered the wall in hundreds upon hundreds of drawings. Aragonés recalled his early difficulties in Mexico, saying, "I didn't have too many friends because I had just arrived. You're the new kid, and you have an accent. I've always had an accent... When the other kids make fun of you, you don't want to get out of the house. So you stay at home, and what do you do? You take pencils and start drawing."

Humberto Ramos (born 27 November 1970) is a Mexican comic book penciller, best known for his work on American comic books such as Impulse, The Spectacular Spider-Man, The Amazing Spider-Man and his creator-owned series Crimson.

In the early 1990s Ramos learned comic book art from Mexican comic book artists Oscar González Guerrero and Oscar González Loyo. Ramos was discovered in 1993 at the San Diego Comic-Con, the comic book industry's largest annual convention, where comic legend Walt Simonson brought him to the attention of the founders of Milestone Media, where he did his first work in American comics in 1994, before being hired by DC Comics as the regular penciller for their new Flash spin-off Impulse, which launched in March 1995. Written by Mark Waid, the superhero/teen comedy series focused on young speedster Bart Allen, the grandson of the second Flash, Barry Allen, and his struggles with growing up in an alienated Alabama suburb.