Haggard was a writer and railwayman, known primarily for his stories in the early SF pulp magazines.
His first story, "Faster Than Light" (October, 1930 Wonder Stories) was written when he was seventeen in response to a contest in Air Wonder Stories and dealt with the idea of accelerating to the speed of light and breaking through into a new universe.
His "Earth Reborn" was the first novel-length story in Future Fiction (November, 1939).
He is remembered today primarily for his Earthguard series of stories in Wonder Stories (1933-1934).
His photograph and brief biography were published in the February, 1939 issue of Amazing Stories.
He was inducted into the First Fandom Hall of Fame in 1992.