Justine Fontes was born in New York City. She grew up on Long Island and later graduated Phi Beta Kappa with a B.A. in English Liternature from New York Univeristy. Justine found her first job in publishing while she was a Freshman. She worked at various publishing houses before becoming a freelance writer. At Little Golden Books, Justine met her future husband, Ron Fontes. They started writing together and have written over 500 children's books. Justine and Ron moved to Maine in 1988.