During his time at Davidson College, he was an officer in the
ROTC, a Lieutenant in the US Army and served as part of the Chaplaincy as a Captain in the Army Reserve. Following his graduation from Union Theological Seminary in Virginia, he served as pastor at Covenant Presbyterian Church in Lynchburg, Virginia. After seven years he served as a
pastor at Davis Memorial Church in Elkins, West Virginia. He then served as pastor in the city where he grew up, Charlotte, North Carolina. Oldenburg also served on local committees in several communities. In Lynchburg, Virginia he helped to organize the Kum Ba Ya House ministry for disadvantaged children. In Elkins, West Virginia he led a successful vote on a bond levy to raise teacher salaries. In Charlotte, North Carolina he was on the Board of United Community Services and was a co-founder and board member of Crisis Assistance Ministry. He received the Martin Luther King, Jr. award and The Order of the Hornet of Mecklenburg County. In Atlanta, Georgia he served on the board of Global Health Action and the University Center of Georgia and worked to co-ordinate relationships between the presidents of all the seminaries of the Presbyterian Church (USA). After serving a total of 26 years as pastor, he then became the seventh president of
Columbia Theological Seminary in 1987, which he held until his retirement in 2000. He served many institutions and churches including the
Presbyterian Church (USA). He served on a variety of committees for the General Assembly of the Presbyterian Church (USA) and became the moderator of the 210th General Assembly in 1998. His platform largely centered on theological education and social justice. He called for support of the ordination of educators and for unity among the nation's church related colleges and universities. As Moderator, he called for every congregation and presbytery to engage in a program of study about what Presbyterians believe about the
Bible and how they read the Bible. For many years, he served on the board of Focused Community Strategies (FCS Urban Ministries) and the Protestant Radio and Television Center (now called
Day1). In 2018, Oldenburg was recognized as a distinguished leader in theological education by the Committee on Theological Education and the Theological Education Fund at the General Assembly for the Presbyterian Church (USA) for his commitment and contribution to theological education and the Presbyterian Church. == Publications ==