President George W. Bush has tapped a federal official with three decades of firefighting experience and a background in emergency management to be the new face of his administration's response to Hurricane Katrina and future natural disasters. Bush on Monday said he would name Miami native R. David Paulison as acting director of the Federal Emergency Management Agency, replacing Mike Brown. Brown resigned Monday after days of criticism over what some said was a slow and ineffective response to Hurricane Katrina's devastation, The Associated Press reported.