Some Department of Labor employees later interviewed by the media said that Callahan was difficult to work for and was known for "belittling and even firing subordinates who did not understand the technical jargon she apparently picked up while studying for her doctorate in computer information systems." A 2001 report issued by Assistant Inspector General John J. Getek cited "allegations of waste, mismanagement, fraud and abuse" against Callahan's office and faulted her management practices for fostering "low morale" among her staff of 125. Callahan was, however, promoted twice by the agency, and in March 2003, she was named to the position of Deputy CIO of the Department of Homeland Security.