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O'Brien Hatfield, PA is a criminal defense law firm that focuses on nationwide federal criminal defense and statewide criminal defense and criminal appeals. Attorney Mark J. O'Brien is the firm's founder and managing partner. He handles federal criminal cases in federal criminal courts statewide and in federal criminal courts throughout the United States. Formerly a Miami prosecutor, Mark is now widely lauded by federal judges and federal prosecutors as one of the best federal defense attorneys in the country. Mark is so in demand that his office is often an airplane with a WiFi connection. Despite reaching such great heights, Mark...