He represents detained and non-detained clients before the Immigration Courts, USCIS, ICE, and various U.S. consulates abroad in a wide variety of immigration cases including asylum, cancellation of removal, naturalization, adjustment of status, Special Immigrant Juvenile Status as well as immigrant and non-immigrant visas. As Pro Bono Committee Chair and Liaison with the American Immigration Lawyers Association he has organized various initiatives to pair pro bono attorneys with non-citizens and mentor attorneys. Prior to focusing on immigration law, Duffy practiced criminal defense as a Louisville Metro Public Defender where he received the Walker Award. He represented individuals charged with a broad range of felonies and misdemeanors, including homicides.