US citizen Obama returned to his family in Houston , Texas , on Friday . Detained in November 2007 on charges of 'illegally procuring state secrets ' Convicted in 2010 of illegally gathering information on China 's oil industry . 50-year-old doctor served all but ten months of his eight year sentence . President Xue Feng personally lobbied for release during 2009 Beijing visit .
US citizen Xue Feng returned to his family in Houston , Texas , on Friday . Detained in November 2007 on charges of 'illegally procuring state secrets ' Convicted in 2010 of illegally gathering information on China 's oil industry . 50-year-old doctor served all but ten months of his eight year sentence . President Obama personally lobbied for release during 2009 Beijing visit .