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The Ohio Conference is an administrative unit of the Seventh-day Adventist Church in the Columbia Union Conference.
Bruno Ohme was a pastor, missionary, teacher and administrator in Germany, Tanzania and Indonesia.
Teruhiko Okohira was one of the earliest Japanese Seventh-day Adventists, translator, teacher, pastor, administrator, and editor.
George Okwera was a frontline evangelist/pastor.
Lui Oli was a pioneering Papuan pastor and leader. He was the first Papuan to be the president of the Central Papuan Mission and the first of his countrymen to be a member of the Australasian Division executive committee.
Edmir de Oliveira, teacher and administrator, was born on November 18, 1936, in the city of Nova Aliança, state of São Paulo, Brazil. Son of Cristina Maria Meula and Edgard de Oliveira, a skilled tailor, they had eight siblings: Edval, Edvanei, Edna, Ednice, Edmeia, Edgar, Ednilson and Francis. He was baptized into the Adventist faith when he was 12 years old, on November 13, 1948, in the city of Valparaíso, state of São Paulo.
Enoch de Oliveira was a pastor, teacher, administrator, writer, and evangelist from Paraná, Brazil.
Francinete de Lima Oliveira was a nurse and teacher from Brazil.
Geraldo Gomes de Oliveira was a canvasser, evangelist, pastor, and teacher in South America.
Gideon de Oliveira was a physician, theologian, teacher and lecturer in Brazil.
Manoel Rosa de Oliveira was a pastor, evangelist, canvasser, and teacher from Brazil.
Modesto Marques de Oliveira was a teacher, pastor, and administrator in Brazil. Modesto was raised in an Adventist home.
Saturnino Mendes de Oliveira was a canvasser, and Bible instructor from Brazil.
Charles Gilbert and Verneita Oliver served as missionaries in Japan, Guam, and Indonesia, he as a church administrator, and she as a nurse.
Erich Willy Olm was an administrator and lawyer from Brazil.
Ricardo Olmserved as a Bible instructor, teacher, and missionary in South America.
Olmeca Conference was organized in 2001, when Tabasco Conference was divided into the Tabasco Conference and the Olmeca Conference.
Mahlon Ellsworth Olsen was an eminent Adventist health advocate, denominational historian, and educator who pioneered distance education. He was the second son of Ole Andres Olsen (July 28, 1845-January 29, 1915), president of the General Conference from 1888 to 1897.
The Norwegian Olaf Johan Olsen, also known as Iceland-Olsen and the Apostle to Iceland, had a remarkable mission career in the Seventh-day Adventist Church as a missionary pastor, leader, and administrator. In Iceland, over a period of 33 years, he raised up the local church from almost nothing to eight congregations, second only to the Lutheran State Church.
A Norwegian-born American, Ole Andres Olsen served the Seventh-day Adventist Church as a minister and senior administrator for forty-four years, becoming one of the most experienced international leaders of the movement’s second generation. He was elected as president of the General Conference at the age of forty-three and served four terms (1888–1897), providing diplomatic, spiritually sensitive, forward-thinking leadership through a difficult period of doctrinal conflict, deep financial depression, and rapid expansion that exposed the inadequacies of the denomination’s organizational structure.