Mathis began his career in public service while still in college, interning for Congressman
Jesse Jackson Jr. in the summer of 2010. In 2012, he returned to Jackson's office as a fellow and later became a full-time staff member that same year. Also in 2012, Mathis worked as a campaign staffer on
President Barack Obama's re-election campaign in Ohio. In 2013, Mathis joined the congressional office of (then-Congressman)
Senator Gary C. Peters as a legislative assistant. Later that year, Peters' announced he would vacate his congressional seat to run for retiring
Senator Carl Levin's U.S. Senate seat. Senator Peters' successfully won the race to replace Senator Levin and retained Mathis on his new staff in the U.S. Senate. During Mathis' tenure Senator Peters served as Member of the
United States Senate Committee on Homeland Security and Government Affairs and the
United States Senate Committee on Armed Services. In 2018, Mathis joined the office of
Senator Mark R. Warner as a Senior Policy Advisor. During Mathis' tenure Senator Warner served as Vice Chair of the
United States Senate Select Committee on Intelligence. The committee and Senator Warner play a leading role in the bipartisan oversight of intelligence agencies, including the
CIA,
NSA and
FBI. In 2019, on behalf of Senator Warner, Mathis led a Senate Cybersecurity Caucus discussion regarding emerging cyber threats and policy recommendations to address them.
C-SPAN covered the event. == Acting career ==