He is also the brother of Kenneth Maryboy, who currently serves as the Navajo Nation Council Delegate in the positions he once held.

[1] Mark Maryboy was elected as the San Juan County, Utah, Commissioner for District Three, and served three terms in that position.

Maryboy met former President Bill Clinton in 1992 at the Democratic National Convention at Madison Square Garden.

[7] He was appointed to serve on the Utah Advisory Committee for the United States Commission on Civil Rights in 1993.

Mark Maryboy serves with this entity as well seeing to the deployment of monetary funds and the Navajo energy issues in San Juan County.

The council waived at least a portion of its rights in a 1968 agreement with the federal government and the Salt River Project, which planned to build a coal-fired power plant near Page.

[citation needed] In 1997, local residents began a protest against Exxon-Mobil's Utah Navajo community policies.

Maryboy established Utah Navajo Health Systems in 1999 along with Donna Singer[citation needed].