Lennix starred in the
Showtime Networks television film Keep the Faith, Baby (2002) as reverend and Congressman
Adam Clayton Powell Jr.; in the film
Titus (1999), based on
Shakespeare's
Titus Andronicus, as Aaron the Moor; and in the
ABC television series Commander in Chief. For ten seasons, Lennix co-starred in the role of Harold Cooper, assistant director of the FBI Counterterrorism Division, on the
NBC drama
The Blacklist (2013–2023). In film, Lennix has had supporting roles such as
The Five Heartbeats (1991),
Comfortably Numb (1995),
Get on the Bus (1996),
Love & Basketball (2000),
The Matrix series (1999–2004),
Ray (2004),
Barbershop 2: Back in Business (2004),
Stomp the Yard (2007), and
State of Play (2009). In television, he had a recurring role in
Diagnosis: Murder as Agent Ron Wagner as well as a guest
voice role as
Mar Londo in the
Legion of Super Heroes episode "Timber Wolf". He also had a recurring role in the
sixth season of
24 as
Muslim civil rights activist Walid Al-Rezani. He appeared on the series
House M.D. as a paralyzed jazz trumpet player, and in six episodes of
ER as Dr. Greg Fischer. He also appeared in the episode "The Blame Game" of the first season of
Ally McBeal. He played the parts of
Boyd Langton in
Joss Whedon's series
Dollhouse and
U.S. president Barack Obama in the comedy sketch show
Little Britain USA. In 2007, he was an official festival judge at the first annual
Noor Iranian Film Festival. In July 2014, Lennix formed his own production company Exponent Media Group (EMG) along with long time business partner Steve Harris. EMG had a distribution deal with NEHST studios for three of the company's titles
Mr. Sophistication,
H4 (a street version of William Shakespeare's
Henry IV, which he also starred in), and
Revival!.
Batman v Superman: Dawn of Justice in 2016 featured Lennix reprising the role of Calvin Swanwick from 2013's
Man of Steel, both directed by
Zack Snyder. Lennix made an additional appearance as Swanwick in Snyder's version of
Justice League, released in 2021. During the Chicago
Goodman Theater's 2024–2025 season, Lennix played the role of Henry Drummond in the
Jerome Lawrence and
Robert E. Lee play
Inherit the Wind. ==Personal life==