She is best known for playing the young Minerva McGonagall in the Fantastic Beasts franchise, which is a spin-off prequel of the Harry Potter film series.
[4] Her television credits include Ballykissangel, Fair City, The Bill, Bachelors Walk, Foyle's War and Clone.
That same year, she appeared as a novice nun with a secret in the episode "A Sacred Trust" of the detective drama series Midsomer Murders.
On film, Glascott has appeared in This Is My Father, Crush Proof, Goldfish Memory, Omagh, The Duel and Brooklyn.
She also starred in Torstein Blixfjord's 2012 short film Bird in a Box, alongside Brian d'Arcy James.