Jack is is the second son of Arizona State Senator Jack C. Jackson, Sr. He is a member of the Navajo Nation, from the Near The Water (Tóahani) Clan, and born for the Tower House (Kinyaa'aanii) Clan. His maternal grandfather is from the By The Water (Ta'baahi) Clan, and his paternal grandfather is from the Salt (Ashiihi) Clan. He was born and raised on the Navajo reservation in Arizona.
Jack is the founder of J. Jackson Consulting, a company specializing in tribal, state, and federal government relations, legislative advocacy, and political consulting. During the Second Regular Session of the 45th Arizona State Legislature, he advocated on behalf of the Navajo Nation and the Ak-Chin Indian Community as a lobbyist with the law firm of Sacks Tierney P.A.
In 1989, shortly after obtaining his Juris Doctorate degree from the Syracuse University School of Law, Jack moved to Washington, DC where he worked for 12 years representing tribal governments and tribal organizations. He began his advocacy career as a Legislative Associate, and then the Deputy Director, for the Navajo Nation Washington Office representing the concerns of the Navajo Nation before the federal government and various agencies.
Jack then moved on to become the Director of Legislative Affairs, representing minority health interests, at the National Minority AIDS Council, the premier national organization dedicated to developing leadership within communities of color to address the challenges of HIV/AIDS.
In 1995, Jack went to work at the National Indian Education Association, the largest and oldest Indian education organization in the nation, as a Legislative Analyst. There, he represented the education concerns of over 3,000 American Indian and Alaska Native educators, school administrators, teachers, parents, and students.
In 1997, Jack became the Director of Governmental Affairs for the National Congress of American Indians, the oldest, largest and most representative Indian advocacy organization in the nation which serves as a forum for consensus-based policy development among its membership of over 250 tribal governments. His main responsibility was to ensure that those administrative, legislative and appropriation measures before the United States Congress which affected Indian Country.
In April 2000, Jack was appointed by Department of Health and Human Service Secretary Donna Shalala to serve on President Clinton's Advisory Council on HIV/AIDS. He was one of two American Indians on the 34 member council providing recommendations to the President on the federal government's response to the AIDS epidemic in the United States and the world.
Jack also served as a board member for 5 years for the National Native American AIDS Prevention Center, the largest Indian AIDS prevention organization that provides capacity building, training, and technical assistance services to Native American organizations, agencies, and communities. He currently provides public policy consultation on how to better address the HIV/AIDS epidemic now affecting tribal and urban Indian communities.
Elected member of the Arizona state house in 2002, he became the first openly gay Native American elected to a state legislature.