Mohn is the owner and operator of a Columbia City lodging business and president of RAM Columbia LLC, a community development company specializing in adaptive re-use and infill development. He was a founding director of the Rainier Valley Community Development Fund, serves on the board of the Columbia City Business Improvement Area, and actively participates in the Columbia City Business Association. He holds a Master of Public Affairs degree from Princeton University and a BS in Engineering from the US Military Academy at West Point.