Pastors John and Sarah Groesser moved to Chelsea, Michigan shortly after they were married in 1976. Both were born again as young children. John and Sarah have three sons and one granddaughter.

They consider Kenneth Copeland their "spiritual father" having grown up on his teachings.  Patricia King and her ministry, Extreme Prophetic, have been a great help in launching them into the prophetic ministry.

Both John and Sarah have served in a variety of ministry positions over the years pitching in wherever help was needed - cleaning, organizing social events, nursery work, children's church, youth ministries, adult ministries, visitation, nursing home ministry, and prison ministry. They were ordained as pastors of Chelsea Full Gospel Church in 1988 where they pastored until 1996. After serving five years in another local church, John and Sarah founded Fire Mountain Worship Center in May of 2001.