Jennifer Lynn Siebel Newsom (born June 19, 1974) is an American documentary filmmaker and actress. She is the director, writer, and producer of the film Miss Representation, which premiered in the documentary competition at the 2011 Sundance Film Festival. The film examines how the media has underrepresented women in positions of power. Her second film, which she wrote, produced, and directed, was The Mask You Live In, which premiered at the 2015 Sundance Festival. It is an examination of American society's definition of masculinity.