J. Patrick Maher is the U.S. official in charge of subverting the Cuban government and making sure that they don't threaten our security:
"Such efforts are critical today, as policy-makers have increasingly focused on the challenges that Cuba and Venezuela pose to American foreign policy," a statement from Negroponte's office said.
I think assigning spy master has more to do with changing the Cuban government into one that is more comfortable for Americans. In the words of State department spokesmen Casey,
"What we want is a transition from the current dictatorship to a democratic government," Casey said. "And we certainly don't think that a transition from Fidel to Raul Castro fits that bill."