Born and raised in central Pennsylvania, Dr. Robert K. Flayhart earned a B.S. in Quantitative Business Analysis from Penn State University, a Master of Divinity from Trinity Evangelical Divinity School, and a Doctor of Ministry from Covenant Theological Seminary, where his dissertation focused on Gospel-Centered Mentoring.

From 1982–1985, Dr. Flayhart served with Campus Crusade for Christ at Florida State University. During his seminary years (1985–1988), he assisted in a church-planting effort on the North Shore of Chicago. In 1989, Briarwood Presbyterian Church called him to plant a daughter church, Oak Mountain Presbyterian, which held its first service on Palm Sunday of that year. He went on to serve as Senior Pastor for 35 years before transitioning, on January 1, 2024, to his current role as Founding Pastor at Large, continuing to serve full-time on staff at OMPC.

Under his leadership, Oak Mountain Presbyterian has grown to approximately 2,500 members and now employs 43 full-time and part-time staff. In 1999, the church also launched Westminster School at Oak Mountain, which today serves 594 students in grades K5–12.

Dr. Flayhart currently serves on the Board of Covenant Theological Seminary in St. Louis, Missouri, and has served on several committees within Evangel Presbytery of the PCA. He and his wife, Laurie, have been married for 41 years and are blessed with three adult children: Joshua (37) and his wife Kara; Hannah (35) and her husband Kevin; and Michael (33) and his wife Julia, who serve as missionaries in Japan. They are the proud grandparents of five grandchildren, three of whom are adopted.