The Rev. Dr. Jon D. Vieker is senior assistant to Rev. Dr. Matthew C. Harrison, president of The Lutheran Church–Missouri Synod. Prior to joining the president's staff in September 2010, Vieker served as assistant director for the LCMS Commission on Worship, a position he began in November 1998. In that position, he was involved with all aspects of research, development, editing and production of Lutheran Service Book and its core companion volumes.
