Dan Green is an award-winning children's author who has sold millions of books worldwide. He specializes in all things scientific, from the periodic table and the human body, to rocks, space exploration and climate change. Living in London, he is a fan of jokes, traveling and dinosaurs! Rachel Katstaller is an illustrator and strategic designer from tiny tropical El Salvador. She graduated with honors as a strategic designer from the Escuela de Comunicación Mónica Herrera in 2013, and took up the Summer Residency in Illustration at the School of Visual Arts in New York City in the summer of 2014. Since then, Rachel has relocated to the Alps along with her cat, Hemingway.