He was born in Barcelona on December 23, 1975. Roger Olmos became interested in the world of illustration from a very young age, when he began to spend time in his father's studio at home, where he watched him draw and paint. There he became fascinated by authors such as Brad Holland, Caza and Brian Froud. After attending the Llotja Avinyò School of Arts and Crafts in Barcelona, he began his apprenticeship as a scientific illustrator at the Dexeus Clinic in Barcelona, during which he learned a lot about textures and anatomy. However, over time he decided to turn to children's books. In 1999 he met his first publishing house, Kalandraka, at the Bologna Children's Book Fair, with which he would publish his first book “Tío Lobo” the following year. Since then he has illustrated more than fifty books for numerous Spanish and international publishers such as: “Edelvives”, “Penguin Random House”, “Macmillan”, “Kalandraka”, “Oqo Editora”, “Ediciones B”, “La Galera”, “ Teide”, “Anaya”, “Edebé”, “Planeta”, “Baula”, “Logos edizioni”, “Melhoramentos”, “Bromera”, “Ediciones 62” and “Pirueta”. He is a vegan and animal rights activist, and actively collaborates with the Foundation for Orientation and Action in Defense of Animals (FAADA) based in Barcelona. This collaboration led to the publication in 2014 of the book “Speechless” – Senzaparole, praised by writers such as Jane Goodall and J.M. Coetzee, and which Roger has described as one of the most important and personal books of his career. He also works with various advertising agencies and television channels.