"What's at play there is somebody who's really in an existential crisis," Spector says of George in the season finale.

After a tense and dramatic third season, HBO ’s hit period drama, which follows New York City ’s high society in the 1800s, ended Sunday with railroad tycoon George Russell (Morgan Spector) walking out on his wife, Bertha Russell ( Carrie Coon ).

Before they starred together in The Gilded Age, Carrie Coon and Morgan Spector made a completely nuts short called Great Choice.