From 2007 to 2014 , Zatezalo was chairman of the coal company Rhino Resources . Rhino Resources clashed with federal regulators when the Obama administration tried to boost industry-wide mine safety enforcement . The company received pattern of violations warning letters from MSHA in 2010 and 2011 , during a time when agency executive Joe Main was increasing enforcement following the Upper Big Branch Mine disaster
Upper Big Branch Mine disaster
Upper Big Branch Mine disaster
David Zatezalo