Born in Lebanon,[1] Marwan grew up in Beirut before moving to Iowa in the United States as a teenager.
[4] Marwan made her screen debut in 2013, when she starred in her first feature film The Valley by Lebanese writer and director Ghassan Salhab.
[5][6] In 2020 she appeared in Tangiers-set television series Little Birds alongside Juno Temple, playing the part of dominatrix Cherifa Lamor, in her first English-language screen role.
In 2021, she starred in Mounia Akl’s debut feature film Costa Brava, Lebanon.
[12][13] In 2024, she has a main role in Steven Knight espionage thriller television series The Veil alongside Elisabeth Moss.