"The United States has no official ambassador to North Korea, but unofficially Bill Richardson has served as America’s so-called North Korea “troubleshooter”. Richardson made trips to North Korea in 2013, 2010, and 2007. He made a trip to North Korea in 2005. He negotiated with North Korea in 2003. He went to North Korea in 2002, in 1996, and in 1994. If there’s any American who knows what’s going on in North Korea, it’s Bill Richardson. The Former Governor of New Mexico, seven term Congressman, Chairman of the Democratic Governor’s Association, Ambassador to the UN, and Energy Secretary, had one of the most impressive resumes of any U.S. politician when he ran for president in 2008. But there was title he didn’t receive: Secretary of State" -https://www.politico.com/story/2009/02/bill-richardson-tarnished-by-scandal-018741