Scott Lape really, really loves numbers. He has over 30 years of experience as a mathematics writer and editor, and even more years of experience counting to 100. He lives in Northern California with his wife and a cat named Lucy.

Víctor Medina is a freelance illustrator who lives surrounded by books in Madrid, where he graduated in Design at Universidad Complutense. His work combines the use of rhythmic color palettes with his main influences: Art Deco, the Victorian era, and the design and illustration of the 50s.