Mark R. Levin is president of Landmark Legal Foundation.
According to a biographical note on the website of the Young America's Foundation Levin "served previously in the Reagan Administration, including chief of staff to Attorney General Edwin Meese, Associate Deputy Attorney General of the United States, and Deputy Solicitor at the U.S. Department of the Interior. Mr. Levin is an expert on the U.S. Constitution and government ethics. He represented Mr. Meese during the Iran-Contra investigation and was a leading advocate for the impeachment of President Bill Clinton." 
"He is an MSNBC legal analyst, a contributing editor of National Review, and a frequent contributor to the Washington Times and Human Events. Mr. Levin often appears on CNN's Crossfire, CNBC's Rivera Live, and Fox News Channel's Hannity & Colmes. Rush Limbaugh appointed Mr. Levin head of his 'legal division'," the biographical note states.
- Young America's Foundation, "Biography: Mark Levin", undated, accessed March 2004.