Bernhard Albert Aaen was an ordained minister, missionary to Indonesia, educator, and administrator from North Dakota, U.S.A.
George Abbott, physician and author, was the first dean of what became the School of Medicine at Loma Linda University and served for more than three decades in the roles of medical director and surgeon at leading Adventist sanitariums. Dr. Cora Richards Abbott, an obstetrician, engaged in medical ministry in tandem with her husband.
Malcolm Edwin Abbott was the superintendent of the Seventh-day Adventist Mission in New Guinea when he was taken as a civilian internee during World War II in Rabaul, New Guinea, and subsequently lost his life at the age of 33.
Johnson O. Achilihu was the president of the East Nigeria Conference from 1988 to 1997.
Christian Abraham Ackah was a founding member of the Seventh-day Adventist Church in Ghana. In addition to his work in literature evangelism, he founded two churches and two schools, and was the first Ghanaian to be ordained a church elder and to serve on a union mission executive committee.
Dorothy Evans Ackerman taught voice lessons and directed choirs at several Adventist schools (especially Southern Missionary College, now Southern Adventist University).
Pastor Jesse P. Acosta, Sr. was a colporteur, minister/evangelist, and leader from the Philippines.
George Adair provided 37 years of sound management in Sanitarium Health Food Company and Sydney Sanitarium and Hospital in the Australasian Union Conference, ensuring the viability of these institutions in both the Depression and the years of World War II.
Reginald “Reg” and Leila Adair served the Seventh-day Adventist Church in Australia, at the General Conference headquarters, and in the Far East, specifically the China Division during the time of the Communist takeover.
Cyrus and Nola Adams, born in New Zealand, gave forty-one years of service to the Church in the South Pacific Division. Cyrus was a pastor, evangelist, teacher, missionary, and conference administrator.
Richard and Miriam Adams commenced their married lives as early missionaries on Pitcairn Island. After five years on Pitcairn they spent nine years in self-supporting medical ministry on Norfolk Island.
Charles D. Adamson was one of the pioneering Caribbean-Antiguan literature evangelists and lay leaders in the eastern Caribbean from the early 1890s until his death in the mid-1930s.
Caleb Oyelayo Adeogun was a pastor, teacher, evangelist, and church administrator from Nigeria.
Joseph Adeyemo Adeogun was a pastor, evangelist, teacher, and church administrator from Nigeria.
Jimmy Jiamah Hadji Adil, Sr. was a missionary to the Muslim populations in the Philippines. He was the first Maguindanaon convert to Adventism and the first Filipino Muslim to be ordained to the Adventist ministry and become mission president.
Herbert William Adrian served as secretary and treasurer for the Tasmanian Conference and the Fiji Mission.
Alfredo Aeschlimann, pastor, administrator, educator, served in the Austral Union Conference, Antillean Union, Mexico Union and Inter-American Division.
Eugene Theodore Agard was a physicist and Seventh-day Adventist exemplar for creationism.
Agbedigue Kodjo Raphael, the first Togolese pioneer and Adventist evangelist, was born in 1942 in the village of Kolo-Mésiwobe (south of Togo).
David Narter Agboka was among the first native Ghanain ministers and evangelists in Ghana.