She began her career directing music videos, later moving to the television and movie industry in 2010 with the drama For Colored Girls as an executive producer.
Stewart began her career directing music videos, working with Macy Gray, Common, Eve, Keyshia Cole, Sunshine Anderson, Joss Stone, Jay-Z, Missy Elliott, Bilal, and 50 Cent.
[2] Clutch writer explains of Stewart's music video work: "With incredible artistic direction and originality, Nzingha provides imagery, mood, and storyline effortlessly.
With This Ring aired in 2015, "explor[ing] relationships between four African-American women who vow to get married within a year of attending a friend’s wedding,"[5] starring Regina Hall, Jill Scott, and Eve.
Adapted from the 2013 Brazilian series As Canalhas, Bitches follows a "different woman each week confiding her dirty deeds and misadventures to her hair stylist.
[13] In 2021, it was announced that Stewart would direct the pilot as well as four additional episodes of From Scratch, a Netflix limited series from showrunner Attica Locke.