EXCLUSIVE: Nana Mensah has been promoted to series regular for Season 4 of Netflix ‘s hit political drama The Diplomat .

Mensah has been with the show since Season 1 in the recurring role of Billie Appiah, the tenacious and extremely loyal White House Chief of Staff Billie Appiah, who has become much more involved in the story over the course of three seasons as the President of the United States has evolved from an opaque character to a key figure in U.S. Ambassador Kate Wyler’s (Keri Russell) investigation into the bombing of a British aircraft carrier in the Persian Gulf. In Season 3, Billie must ingratiate herself with newly minted POTUS Grace Penn (Allison Janney)— the very woman she’d been back channeling to oust as VP.

Mensah is a Ghanaian-American writer, director, actor

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