after being nominated by the president and confirmed by the united states senate, on december 1, 2004, nahmias returned home to atlanta to take office as the united states attorney for the northern district of georgia. he served as the chief federal law enforcement officer in the district and managed an office with approximately 75 lawyers who represent the united states in all criminal and civil litigation in federal court in the district. in january 2005, nahmias was appointed to serve on the attorney general's advisory committee of united state attorneys (agac), which reviews and recommends policies for federal prosecutors nationwide. the attorney general also appointed nahmias as chairman of two of the agac's most important subcommittees: terrorism and national security (september 2005-october 2007) and white collar crime (october 2007 – 2009).