Tomas Marco Nadal is the author of 'Kalar', a prehistoric series published in small books. He signed his work with Tomas Marco, T. Marco or just simply Marco. His father was killed when Nadal was aged 7, because of his religious beliefs. Therefore, he had to start working at a young age to support his family. He stopped his studies and took on several jobs, but always remained eager to learn. He showed big interest in history and archeology, but also in art and drawing. He learned the finer points of the comics profession of Jesus Blasco and Vicente Roso.