Nelson is the Executive Director of the National District Attorneys Association (NDAA), having previously served 3 years as NDAA’s Director of Government Affairs bringing comprehensive experience across Congress, federal agencies, and the criminal justice system stakeholder community. Prior to NDAA, Nelson served as the Director of Government Affairs for The Charles Group in Washington, DC, where he represented the Major County Sheriffs of America (MCSA), an organization representing elected sheriffs from counties with populations over 500,000 people. Nelson also brings federal agency experience as he spent time in the Science and Technology Directorate at the Department of Homeland Security. With that experience, he brings insight into crisis response programs and emerging technologies in the first responder community.