Myron Shook Harrison was born in Los Angeles, CA, on April 10, 1941. He was converted when he was about ten years old. His educational training included studies at Central State College, Stevens Point, WI; Moody Bible Institute, Chicago, IL; Fort Wayne Bible College (BRE), Fort Wayne, IN; and Toronto Institute of Linguistics. He was directed into full-time Christian service through the book, Shadow of the Almighty by Elisabeth Elliot. Myron Harrison died in 2015.

Elizabeth Laura "Betty" Harrison was born in Brockville, ON, Canada, on February 23, 1940. She received an RN at Kingston General Hospital School of Nursing, and then attended Moody Bible Institute before receiving her BS from the Fort Wayne Bible College.

The Harrisons married after their studies at Moody. After completing their work at Fort Wayne and at the Toronto Institute of Linguistics, they were accepted in 1966 into Overseas Missionary Fellowship (OMF). In 1967 they sailed for Singapore for orientation, assignment, and language study. They were assigned to the Philippines and in August of 1967 they sailed to Manila. From there they traveled to Calapan on Mindoro Island, where studies of the Tagalog language continued for six months. During this time, Myron helped in the construction of the Mangyan Bible School. In 1968, they began working in Mabini, Batangas, on Luzon Island and the next year they were redesignated to Bauan, Batangas, to work in evangelistic outreach.

After a furlough in 1971, the Harrisons were assigned to Taal, Batangas, where they worked as church planters and trained lay people through Theological Education by Extension (TEE). In 1977, after their next furlough, the Harrisons were assigned to the Bicol area at Daraga, Albay. In the same year, Myron began a radio program, in Tagalog, called "The Living Rock," on DWAS, the local radio station operated by the Far East Broadcasting Company (FEBC); in 1978 Betty began a broadcast over the same station, in English, called "Festival of Praise." By 1977, Myron took on administrative duties as OMF's Superintendent of Southern Luzon Field.

During their 1982-83 furlough in the States, Myron was ordained at Calvary Memorial Church in Racine, WI, and completed a Master of Missiology program at Trinity Evangelical Divinity School, Deerfield, IL, after which they returned to the Philippines. Myron resumed his duties as Superintendent of the Southern Luzon Field working out of the OMF headquarters in Manila, while Betty worked among the urban poor.

The Harrisons had three children: Timothy Paul (1965), Daniel Scott (1968), and Melody Lynn (1970). In 1990 the Harrisons continued to work in the Philippines.