The Drowns worked alongside missionary Roger Youderian and his family for three years in the 1950s. They had also been instrumental in directing them to the mission field. In 1955, Roger joined with four other missionaries in Operation Auca, an effort to reach the Huaorani, another Indian tribe in the area. When the five men turned up missing, Drown led the ground search party into Huaorani territory to locate the men. They discovered four of the bodies, including Roger's and buried the men and a mass grave. Drown led a quick funeral service at the gravesite before a severe tropical storm blew in. Roger's wife Barbara continued to work with the Drowns for many years after Roger's death.
In 1959, after 15 years living in Ecuador, and three years after his fellow missionary had been killed, the Drowns were asked to write a book about their lives as missionaries. After the success Elisabeth Elliot's best-seller Through Gates of Splendor, the publishers believed such a book would be in demand. And so the Drown's co-authored a book which became the memoirs. It is called Mission to the Headhunters.
The Drown's son Ross became a missionary pilot and is now in business. He married Kathy Saint, the daughter of Nate Saint who was also killed during Operation Auca. Their daughter Laura is also a missionary. She serves in Guayaquil, the largest city in the nation her parents formerly served at. She lives with her husband, Dave Erdel.