Don has proudly served the 3rd District of Jefferson County as its Commissioner since 2010. Follow him @RosierForJeffco Learn about what Don has accomplished for District 3 at

A third generation Coloradoan, Don’s lived in Jefferson County his entire life. He earned his B.S. in civil engineering, with a emphasis in water resources, from CSU, and has worked as an engineering consultant in both the public and private sector, focusing on land development, construction field, and energy exploration and development.

Extremely active in the local community, Don coaches lacrosse, volunteers as chairman of the Jefferson County Community Development Advisory Board, teaches Sunday school, volunteers at local schools, and enjoys hiking in the mountains, fishing at a local lake, attending the Harvest Festival to watching the spectacular sunsets from his back porch with his family.
Jefferson, CO
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