Timmerman was a former administrative bishop in several states and regions, including Southern Ohio (1980-1984), Rocky Mountain (1992-1994), Florida-Tampa (1994-1998), and Alabama (2006-2008). In 1998 he was elected to the post of Assistant Director of Evangelism and Home Missions and served as director from 2002-2006. Two years later in 2008 he was elected to a second term as Assistant Director of Evangelism and Home Missions, serving until 2012. He also served as a member of the International Executive Council from 1994-1998 and again from 2006-2008.

Throughout his ministry, Larry Timmerman was a frequent speaker at camp meetings, prayer conferences and evangelistic crusades. He served on the Evangelism Board for eight years and was the author of Spirit of Growth.
Larry and Jan Timmerman are the parents of two children, Debbie Sulcer and Larry, Jr, and they have three grandchildren and four great-grandchildren.
“Larry Timmerman set the example of a humble and effective leader in the Church of God,” stated General Overseer Tim Hill. “He will be remembered for his powerful evangelistic messages and the reach of his leadership across the many capacities he filled.”
Funeral arrangements are being finalized by the Rush Funeral Home in Cleveland, Tennessee.