Hargrave Walton is the most common pen name of a Canadian writing duo, who use a variety of psuedonyms, including Jeanne H Walton, S Hargrave, S Hargrave-Walton, Jeanne Hargrave-Walton, and the Hargrave-Waltons. But you can just call them Hargrave and Jeanne.
Their writings range from genre fiction to memoir to literary fiction; many of them include recurring characters.