Mili Hernández is a well-known activist for LGTBQ rights. She is a bookseller in Berkana bookstore, a milestone for diversity in Spain. She is also an editor and founder of EGALES, an publishing house born in 1995, specialized in LGTBQ literature. Federico and All His Families is her first children's book.

Gómez studied Fine Arts at the well-known University of Salamanca (Spain). A new talent, she has worked for several publishing houses in Europe, such as SM in Spain, Le Petit Bulles Edition in France, and Scholastics and Sterling in the USA. Her book Hedgehog and Rabbit. The Scary Wind is a Junior Library Guild Selection.