On Montgomery's advice and recommendation, Rosenbladt proceeded to doctoral studies in theology at the University of Strasbourg, France, and graduated in 1978 with a Ph.D.[4] Rosenbladt was a Lutheran minister in the Lutheran Church – Missouri Synod and assumed pastoral positions in several parishes in California: Huntington Beach, Temple City, San Gabriel, and La Jolla.
He lived in California since 1969 and held teaching posts in that state at the Graduate Theological Union in Berkeley (1973–1977) and at Westmont College in Santa Barbara (1973–1977).
He was an adjunct member of faculty at Concordia University Irvine from 1979 to 1984, until receiving a permanent lecturer's position in which he taught theology starting in 1984.
He was also a frequent contributor to Modern Reformation magazine and a regular participant on The White Horse Inn radio program.
On the occasion of his sixty-fifth birthday, he was honored with a festschrift, Theologia et Apologia: Essays in Reformation Theology and its Defense Presented to Rod Rosenbladt.