Print When director David Fincher called to tell costume designer Trish Summerville that his long talked-about film “Mank” — starring Gary Oldman as “Citizen Kane” screenwriter Herman J. Mankiewicz — had gotten the green light, she knew it was destined to be “smart, funny, poignant, beautiful; it would tick all the boxes!” “I definitely jumped at the chance,” says Summerville, who worked with Fincher on numerous other projects, though never before on a black and white feature film. “Besides a great story, with David I knew it was going to be incredible. I love working with him, and aside from this, he’s one of my favorite humans.”