James Jay Lee

The gunman holding hostages in the Silver Spring, Md., headquarters of the Discovery Channel has been tentatively identified as James Jay Lee, an apparent eco-fascist who thinks that immigrants are breeding "filthy human children" and helping to wreck the planet.

Lee, 43, had been arrested in February 2008 at a rally he organized outside the same building to demand the channel help find solutions to the global population explosion and the extinction of many animal species

Source: http://www.huffingtonpost.com/mark-potok/apparent-eco-terrorist-ho_b_702549.html