Chema Heras is an English teacher, author, and translator from Pontevedra, Galicia, Spain. He has written and edited a number of books and previously lived in Australia while working for the education department of New South Wales. The Spanish edition of Grandparents, called Abuelos, won the prestigious Premi Llibreter de Narrativa Àlbum Il.lustrat in 2003.
A graphic artist and now author and illustrator of picture books, Rosa Osuna lives and works in Madrid. Grandparents is her first book.
André Letria is a Portuguese illustrator. He has worked as a book and newspaper illustrator as well as a set designer for both theater and animation. His books include If I Were a Book, also published by Chronicle Books