Harold Tso lived 87 years after being born to Franklin Tso, Sr. and Sarah Goodluck Tso in Fort Defiance, AZ. He was the 1st of 7 children. His favorite things to do were fly fishing, golfing, studying the Bible, being with those he loved, and going to lunch. He is survived by his wife, Mary, his four children (Lyman, his wife Michelle, and their two children, Philip, Barry, and Dezbah and her husband Manuel Jesus), his siblings (Dr. Wilbur Tso, Lorraine White, and Valerie Reisinger), his grandchildren (Joshua and Chenoa), and extended family.

While a baby, Harold family moved to Shiprock, NM. He attended elementary school in Shiprock and middle and high school in Farmington, NM. He excelled at Farmington High School and earned a place at Cavin College in Grand Rapids, MI. He graduated with a Bachelor of Science degree in Chemistry and Biology.

Following college, Harold put his chemistry and biology education to use by working for the New Mexico Department of Health, Eberline Instrument Corporation, the Navajo Nation, and Jacobs Engineering. He also married Mary Thomas; they had four children – three sons and a daughter.

Harold worked for Eberline Instrument Corporation as a radiochemist. In all, Harold worked 18 years at Eberline performing over three separate periods and supervising the radiochemical analyses and managing the laboratory.

Harold worked 11 years for the Navajo Nation; he was proud of being able to serve his people as Executive Director of three offices: the Navajo Environmental Protection Commission, Navajo Energy and Resource Development, and Navajo Division of Resources. In these roles, he submitted formal testimony to Congress or committees about abandoned uranium mills, United Nuclear Corporation uranium spill, U.S. Surface Mining Control and Reclamation Act, and the U.S. Clean Air Act. Harold was appointed by President Jimmy Carter to serve on the U.S. National Commission on Air Quality. He also served on the Science and Technical Assessment Committee for the U.S. Environmental Protection Agency. He led the committee that negotiated the lease agreements with energy and mineral companies that resulted in an increase in tribal revenues.

Harold worked as a chemist for five years at Jacob Engineering Group Inc. He assisted various project teams evaluating analytical data, supervised the hydrology laboratory, and investigated the applicability of Federal and State environmental laws and regulations for a uranium mine in Cibola county.

Harold retired in 2002. During his retirement, he served the State of New Mexico as a member of the Environmental Improvement Board and later the Water Quality Control Commission. He was appointed by New Mexico Governor Bill Richardson.

His favorite things to do were fly fishing, golfing, studying the Bible, being with those he loved, and going to lunch. He is survived by his wife, Mary, his four children (Lyman, his wife Michelle, and their two children, Philip, Barry, and Dezbah and her husband Manuel Jesus), his siblings (Dr. Wilbur Tso, Lorraine White, and Valerie Reisinger), his grandchildren (Joshua and Chenoa), and extended family.