A lifelong resident of Oklahoma, Dan Whitmarsh has attained a bachelor’s degree in history from the University of Central Oklahoma and both a Master of Liberal Arts and a Juris Doctor from Oklahoma City University. Prior to joining the Commissioners of the Land Office, Secretary Whitmarsh worked in various land-related roles in the oil and gas industry including as a landman, mineral buyer and land manager. In 2019, Whitmarsh joined the CLO as mineral director where he successfully led the transition to online mineral auctions, worked with the Oklahoma Corporation Commission to identify and plug orphan wells and increased solar projects on trust land.

Whitmarsh served as assistant secretary from February 2022 until his appointment as secretary of the land office in February 2023. He is the father of four and lives with his wife in Oklahoma City.