PBS goes behind the scenes with the creators and cast of the new series Mercy Street. Featured in this clip: David Zucker, Executive Producer, Lisa Quijano Wolfinger, Executive Producer/Co-Creator, Mary Elizabeth Winstead, who plays Nurse Mary Phinney, Josh Radnor, who plays Dr. Jed Foster, McKinley Blecher II, who plays Samuel Diggs and David Zabel, Head Writer/Executive Producer.