Yasushi Hashimoto was born in Watsonville, California, on October 9, 1913 to a devout Issei Christian couple. At the age often, he suffered an illness so serious that even his doctors thought that death was imminent. Feeling that the end was near, his parents prayed and asked Yasushi if he was assured of his salvation in Jesus Christ. Yasushi responded by saying “I believe in Jesus Christ.” God not only spared his life, but led him into a lifelong ministry for the Lord.

On July 20, 1938, he graduated from the Huntington Park Training School for Christian Workers and was assigned to the Seattle Holiness Church. He succeeded Eiji Suehiro who had served there for four years. Two years later, he was assigned to serve both the San Fernando and the Baldwin Park Holiness Churches.

On September 21, 1940, he married Elsie Toshiko Noguchi in the Modesto Holiness Church. Elsie had been born in Japan in 1917 and had come to the United States when she was only eight months old. She and her only sister, Elma, had been raised by their saintly stepfather who greatly influenced their lives. Elsie had also studied at the Huntington Park Bible School with both Hashimoto and Sachi Ofuji from the Modesto Church. They all graduated from the Bible school at the same time.

With the outbreak of World War II, Hashimoto was sent to the Amache Relocation Center where he served as a pastor. Leaving camp, he moved to Chicago, where a large number of Holiness members had relocated. There along with Akira Kuroda, he ministered in the English Division of the Lakeside Christian Church which met at the Moody Church. Sadaichi Kuzuhara was pastor of the Japanese-speaking Division. During his time in Chicago, he attended the Northern Baptist Theological Seminary where he graduated with honors.

After his ministry in Chicago, he returned to the West Coast and began to serve at the Evergreen Baptist Church, since the Conference had no openings at that time. After a pastorate at the Ocean View Congregational Church in San Diego, Hashimoto served in a pioneer work of the United Methodist Church in Encinitas. During his pioneer work, he earned a Ph.D. in Human Relationships from USIU (United States International University) in San Diego. However, due to a heart attack, he had to resign from the pioneer work. After his recovery, he taught in the San Diego School System for eighteen years until he retired in 1982.

After his retirement, he was the resident manager of the Kiku Gardens, a retirement facility erected by the Japanese Community in the San Diego area. He served there for more than seven years, until his death on October 29, 1989. His widow, Elsie, currently resides in San Diego.