Background
Walker was born on the 12th of May 1858 at Listowel, Ontario to parents Thomas and Jeanne Maurice Walker. Thomas Walker emigrated in 1856 from Yorkshire, England, to Listowel, Ontario, with his wife of French and English heritage. Having some wealth, Thomas purchased land for lumber in Midwestern Ontario and Horatio was raised in relative comfort. His interest in art may originate from his father who crafted small figures as a hobby, and both his father and the local school teacher encouraged drawing as a pastime.
When he was a child his family settled at Rochester, New York.