He wrote articles for the Fishing Gazette from 1890 on and published works in Forest and Stream from 1903, sometimes under the pseudonym Badger Hackle. Though he never published a book he is often called the father of the American school of dry fly fishing after he imported English fly-fishing tackle and flies and began to alter the English flies to precisely match the insects hatching in the Neversink, Beaverkill rivers, and Willowemoc Creek. He learned to tie flies from reading The Anmerican Angler's Book (1864) by Thaddeus Norris, but he also read British fly fishing literature of the time and corresponded with notable British fly anglers Frederic M. Halford and G.E.M. Skues to perfect his fly tying skills.
Gordon lived his final years and died in 1915 in the Anson Knight house, now deep below the surface of the Neversink reservoir. In 1949, the author, Sparse Grey Hackle (alias for Alfred W Miller), wrote in "The Quest for Theodore Gordon", that Gordon, "was in fact, the father of dry-fly angling in America."
John McDonald is responsible for compiling Gordon's writing into a book The Complete Fly Fisherman: The Notes and Letters of Theodore Gordon.