http://www.irishcentral.com/topics/Barry+O%27Callaghan IrishCentral Barry O'Callaghan en-us http://www.irishcentral.com/story/roots/the_american_in_ireland/barry-ocallaghan---from-billionaire-to-employee-in-two-years-81522192.html http://www.irishcentral.com/story/roots/the_american_in_ireland/barry-ocallaghan---from-billionaire-to-employee-in-two-years-81522192.html Thu, 14 Jan 2010 10:00:16 PST "River Deep Mountain High," sang Tina Turner It must be a song weighing heavily on the mind of Irishman Barry O'Callaghan, head of the publishing giant Houghton Mifflin Harcourt Yesterday O'Callaghan declared that the company's investors are "under water", sunk by a mountain of debt Quite a blow for the man who two years ago was labeled as Ireland's youngest billionaire by the Sunday Times thanks to the value put on his share of the publishing company READ MORE ]]>