Ryun was a speechwriter for President George W. Bush. He is the founder and president of American Majority, a Virginia-based conservative political training institute allied with the Tea Party movement. The group was founded in 2008. Its 501(c)(4) affiliate is American Majority Action, of which Ryun was CEO. Ryun has been a board member of the American Conservative Union. During the 2011 Wisconsin protests against Republican Governor Scott Walker's proposal to restrict collective bargaining and organized labor, Ryun helped organize counter-demonstrations in favor of the legislation.