Andrés and Christina are the Grammy- and Latin Grammy-winning music duo 123 Andrés! Their catchy songs and lively concerts get the whole family dancing and learning, in Spanish and English. They perform live concerts all over the US and Latin America each year, for students and families. Their album We Grow Together Preschool Songs won the 2024 Grammy for Best Children's Album and their album Arriba Abajo won the 2016 Latin Grammy in the same category, as well as the Parents' Choice Gold Award. They are also the authors of the bilingual board books Hello, Friend / Hola, Amigo and Ten Little Birds / Diez Pajaritos.

Eduardo Marticorena is an illustrator from El Salvador. He started in illustration at college, while studying Graphic Design. After college, he worked as a videogames background artist, an animation layout artist, and then as an illustrator for children books with the Ministry of Education of El Salvador. He enjoys illustrating stories but also teaching art to kids and others, so he also works as an art teacher.