Lochbaum is the director of the Nuclear Safety Project at the Union of Concerned Scientists. He monitors ongoing safety issues at US reactors, testifies before Congress and the Nuclear Regulatory Commission, and provides informed analysis of nuclear plant conditions and incidents, such as the March 2011 crisis at the Fukushima Daiichi facility in Japan. A nuclear engineer by training, Lochbaum worked at nuclear power plants for 17 years. He left the industry in the early 1990s after blowing the whistle on unsafe practices and joined UCS in 1996. He left UCS in 2009 to work for the NRC as a reactor technology instructor and returned to his post at UCS a year later.