An American science fiction writer whose works were influenced by his background in law, he published his first novel, Flight into Yesterday, in 1953. His final work, Cybele With Bluebonnets, was published in 2002.
After graduating from George Washington University, he worked as a patent attorney.
He was nominated for both Hugo and Nebula awards.
He grew up in Colorado City and Fort Worth, Texas. He married his wife, Nell, in 1938.
Frank Herbert's novel, Dune, was influenced by Harness' work.