Marshall's first television role was a small part in an episode of
Criminal Minds. Her other acting credits include parts on the television series
NCIS,
Supergirl, and
This Is Us. Marshall was asked to read for a role on
For All Mankind unexpectedly, while auditioning for a different show. She landed the part of
Danielle Poole,
NASA's first Black astronaut, that same day. == Personal life ==