Jeff is a retired banker and insurance agent. He is a fourth-generation Nebraskan and resides in Newman Grove. Gerhart has served on the Newman Grove Community Foundation Fund, an affiliated fund of Nebraska Community Foundation, since its beginning and volunteers on its advisory committee. He is also involved with the Bud and Georiganne Gerhart Donor Advised Fund.
As a banker he served in the leadership of the Nebraska Independent Bankers Association, the Independent Community Bankers of America, and the Federal Reserve Board of Kansas City board of directors.
Jeff and his wife Becky have two adult children and three grandchildren.
He is a member of the United Methodist Church in Newman Grove, and Newman Grove Masonic Lodge #305 Ancient Free & Accepted Masons.