Harrington, although not known for Navajo, developed the orthography which later became to be known as the “Young and Morgan alphabet”. (Spolsky 1970).
This was crucial since between 1940-1957 Y&M published a newspaper (Ádahooníłígíí) utilizing this orthography, which is now standardize. “The BIA employed the linguist John P. Harrington, to complete a practical Navajo writing system. Harrington employed Robert Young and William Morgan (the latter a Navajo) to prepare a dictionary in 1943… ” (Lyon 1989: 153)