Carlota Cirera was born in Barcelona in 1985. She has her bachelor's degree in Fine Arts, Master's degree in Plastic and Visual Education, and professional certificate in Graphic Design. During her studies, she worked as a freelancer on children's illustration projects for different publishing houses. She has been devoted to working at the company she founded with coauthor Norma Martinez for the last three years, Biterswit, a graphic design and digital illustration studio. She loves the mountains, being outside, and traveling. Norma Martinez was born in Cerdanyola del Valles in 1985, a small city next to Barcelona. She has her bachelor's degree in Audiovisual Communications from the Autonomous University of Barcelona, specializing in graphic and audiovisual design. She has loved drawing, sculpture, and everything involving creativity since she was a little girl, and has taken many courses related to art: from clay animation to motion graphics (digital animation). At present, several of her children's arts and crafts books have been published, in which recycling and reuse have been an important part to help maximize kids' creativity.