NFL offseason programs begin with mixed player involvement
Former Browns center, NFLPA president JC Tretter retires
Browns' JC Tretter, NFLPA president, pumps brakes on report of possible June minicamp
JC Tretter's term as NFLPA president has included pandemic response and a divisive CBA vote - The Washington Post
Browns center and NFLPA president JC Tretter's next fight: More natural grass
Cleveland Browns' JC Tretter re-elected as NFLPA president
Cleveland Browns center J.C. Tretter elected as NFLPA President
NFLPA president: CBA 'no' vote would've meant different world for players
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
Browns release JC Tretter, turning to Nick Harris at center
Former Packers center JC Tretter voted NFLPA president - Acme Packing Company