Originally from the Bronx, New York, Alimi began his acting career while in high school by performing in community theater productions, such as No Laughing Matter and The Common Thread. He later joined the Manhattan Theater Club and the National Black Theater, where he starred in Holiday Heart and Endangered Species.
Alimi's first television role came on ABC's daytime drama, Loving, where he starred as the troubled youth, 'Frankie Hubbard'. He was also a member of ensemble cast for In the Mix, a teen awareness program. His first primetime role was on New York Undercover
In 1996, Alimi moved to L.A. and shortly thereafter landed a role on ABC's Aresnio. He also appeared in Dream Works' feature film, Deep Impact with Tea Leoni.
Alimi currently stars as 'Special Agent David Sinclair' on the CBS crime drama, Numb3rs.