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.
José Abella was a pioneer of colporteur ministry in Algeria and the first Spanish missionary to carry out pastoral work in Portugal.
William E. Abernathy served the church for 36 years primarily in the roles of institutional management and financial administration.
Clinton Achenbach was an American missionary who served during the early phases of Adventist work in the Spanish-speaking lands of Peru, Puerto Rico, Venezuela, Cuba and the Dominican Republic.
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.
William Brandford Ackah was an Adventist pastor, teacher and evangelist in Ghana.
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.
Anderson Grant Adams was the 15th treasurer of the General Conference of Seventh-day Adventists.
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.
Elbridge Martin Adams, a pioneer American missionary, served in various capacities including as a minister, Bible instructor, evangelist, administrator, and editor. Elbridge and his wife, Sophia, spent more than 40 years in faithful service.
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.