(written from a Production point of view)
Stacy-Ann Buchanan (born 14 August 1982; age 40) is an actress who worked as stand-in and occasionally photo double for Sonequa Martin-Green in Star Trek: Discovery. She received no credit for this work. 
Buchanan was born in Jamaica to a Jamaican father and a Canadian mother, and moved to Toronto, Canada with her family when she was 14.
She previously worked as stand-in on the television series Nikita (2010, with Melinda Clarke and directed by Terrence O'Hara), Copper (2013), Hannibal (2015, developed, written, and executive produced by Bryan Fuller), Taken (2017), and Frankie Drake Mysteries (2017).
As an actress, Buchanan appeared in the short project Catalina Yue: Ambition (2010) and in the Shoot the Messenger episode "There Will Be Blood" (2016, with Patrick Kwok-Choon). In 2015, she appeared in and directed the documentary The Blind Stigma. She previously produced and created the show The Mystic Effect in 2012 and launched her production company, Stacy-Ann Buchanan Productions in 2013.