Less than two years after being appointed CEO, Colleen Walker is stepping down as the Eugene McDermott Chief Executive Officer at Dallas' Perot Museum of Nature and Science. The surprising development was disclosed in a March 30 letter to museum "friends and supporters" from John Jaggers, chairman of the Perot's board of directors. "I am writing to inform you that … [Read more...] about JUST IN: Issue Of ‘Different Views’ Leads To CEO Colleen Walker’s Resignation At Perot Museum Of Nature And Science