Carlos Gimenez started working in 1958 as an assistant penciller. He participates in a lot of different issues for some years, with all kind of genres: western (Gringo), science-fiction (Delta 99), humor, war, action, romance, erotism, horror,... During this period, he gets the best reviews for his work in "Dani Futuro". In 1975 he writes his first comic, "Hom", a science-fiction story based on a novel by Brian Aldiss, and starts writing his most important works: "Paracuellos", "Espana Una Grande y Libre" and "Barrio". He criticizes the dictatorship, which finished in 1975. The stories are often inspired in his own life. The series "Paracuellos" tells the life of children in orphanages like the ones where he himself spent 8 years.
Until 1975, his work was published in the rest of Europe, so he was almost unknown in Spain. When the dictatorship finished, he published his most personal and rough material, and started receiving a lot of letters of right-wing groups threatening to kill him.
He continues working for different magazines, participating in adaptations of Jack London, Stanislaw Lem and Homer. Earlier, he had adapted short stories by G.A. Becquer and E.A Poe. After participating in a lot of european magazines, he creates "Rambla" along with Adolfo Usero, Alfonso Font, Luis Garcia and Josep Maria Bea. Then he publishes another of his most famous volumes, "Los profesionales", in 1982. During the 80's he participates in "Las odiseas de Ulises", "Erase una vez el futuro", "Romances de andar por casa", "Rambla arriba, Rambla abajo", "Bandolero" and "Historias de sexo y chapuza".
In 1991 he publishes "Una infancia eterna", written by french filmmaker Jean-Luc Godard. He was a pioneer in Spain for publishing "Jonas, la isla que nunca existio" through the internet. More recently, he has published another adaptation, "El capitan Alatrite" and a volume about spanish civil war, "36-39: malos tiempos".
In 2005 he received a career award from "Salon del comic de Barcelona". His stories are first class historic and social chronicles. He has been compared to Guido Crepax and Will Eisner, and refered to as "the most talented spanish comicbook creator of all times".