Davis Washines, known as Yellowash, is an accomplished public service leader, a recognized traditional and spiritual leader throughout Indian Country and a former Yakama language instructor in local schools. He currently serves serves as the Willamette Falls Trust Board Chair and as the Government Relations Liaison in the Confederated Tribes and Bands of the Yakama Nation Department of Natural Resources under the Superfund Projects of Fisheries Resources Management.

Until recently, Yellowash was Executive Chairman of the Yakama Nation General Council. He launched his public service career in 1973 with the Yakama Tribal Police Department, where he advanced through the ranks to serve as Chief of Police in 1986 — a role he held until 1996. Following his service on the Yakama police force, Yellowash served on the Yakama Tribal Council and then worked as a middle school counselor. In 2005, Yellowash was once again appointed Yakama Nation Chief of Police, serving until 2008. 

In 2010, Yellowash was appointed Chief of Police for the Columbia River Inter-Tribal Fish Commission, which consists of the following Columbia River Treaty Tribes: Yakama, Warm Springs, Umatilla and Nez Perce. Yellowash retired from law enforcement in August 2013 and was elected Yakama Nation General Council Chairman in December 2014. One of his proudest achievements is when, as Yakama Nation Police Chief, he led the successful effort to restore the original spelling of “Yakama” to the Yakama Nation — as recorded in the U.S. Yakama Treaty of 1855.