Notable works include Batgirl: Year One, Breach, Doctor Strange: The Oath, The Amazing Spider-Man, Daredevil and The Private Eye.
Martín's first professional work was the creation of covers and illustrations for Spanish reprints of various Marvel Comics by Cómics Forum, where he first met fellow artist Javier Pulido (the company was famous for discovering new talents who would become widely known in the American market such as Salvador Larroca and Carlos Pacheco a few years earlier).
[3] After University, Martín went back to New York to show his portfolio and get work at either Marvel and DC; eventually, he was assigned on a short story in The Batman Chronicles: Here is the honest truth.
[2]After that, Martín returned to Spain yet again and spent the next year working on a new comic Houdini with future screenwriter David Muñoz for Planeta-DeAgostini's Laberinto imprint.
He did a few more fill-in jobs[5] and eventually was allowed to pick a writer for his first full project, which ended up being Batgirl: Year One with Scott Beatty and Chuck Dixon.
After five years at DC, Martín moved to Marvel, where he did the acclaimed Doctor Strange: The Oath mini-series with Brian K. Vaughan as well various issues of The Amazing Spider-Man as part of the Brand New Day and Big Time eras.
In 2011, he launched Daredevil, written by Mark Waid and co-drawn by Paolo Rivera, which paved the way for Marvel's more off-beat later series like Matt Fraction and David Aja's Hawkeye.
In 2013, Martín founded Panel Syndicate,[7][8] an online publisher of DRM-free pay what you want webcomics in multiple languages, to release his and Brian K. Vaughan's creator-owned comic The Private Eye.