Lennix currently serves as an artistic associate at the Goodman Theatre in Chicago where he also taught public school for 8 years. Lennix co-founded Chicago’s Legacy Productions with Chuck Smith, a colleague from Goodman Theatre. In addition to his performances on stage, Lennix has also directed a number of productions including Aaron Iverson’s Unjustifiable Acts, Julius Caesar (which he also co-produced) for the Black Ensemble Theatre, The Glass Menagerie, Charles Fuller’s A Soldier’s Play, Douglas Turner Ward’s Absence and Happy Ending, and co-directed The Visit by Kosmond Russell which was made into a feature film.
For television, Lennix starred in "Keep the Faith Baby" (2002) - the Adam Clayton Powell Story for Showtime (for which he was nominated for an NAACP Image Award), and appeared in a recurring role on "E.R." and in guest starring roles on such popular shows as "Judging Amy,” "Ally McBeal" and "The Practice.” He maintained a steady presence on the big screen as well, appearing in “The Human Stain” (2003) as the relative of a young man (Wentworth Miller; older version played by Anthony Hopkins) hiding his black ethnicity; as the owner of a rival barbershop in “Barbershop 2: Back in Business” (2004); and as an FBI officer trying to reign in an independent-minded agent (Aaron Eckhart) in “Suspect Zero” (2004).
Lennix was in episodes of “Century City” (CBS, 2004), “Second Time Around” (UPN, 2004-2005) and “House” (Fox, 2004- ) before landing a regular role as a dying president’s chief of staff who tries to convince the female vice president (Geena Davis) to step aside for the Speaker of the House (Donald Sutherland) to assume the presidency in the highly acclaimed “Commander In Chief” (ABC, 2005- ).