Who directed the  American romantic comedy-drama which Mackenzie Davis  made her film debut in
Mackenzie Davis Mackenzie Davis (born April 1, 1987) is a Canadian actress. She made her film debut in "Smashed", and later appeared in "Breathe In", "That Awkward Moment", and "The F Word", the latter for which she received a Canadian Screen Award nomination.
Blue Valentine (film) Blue Valentine is a 2010 American romantic drama film written and directed by Derek Cianfrance. The film premiered in competition at the 26th Sundance Film Festival. Derek Cianfrance, Cami Delavigne, and Joey Curtis wrote the film, and Michelle Williams and Ryan Gosling played the lead roles as well as serving as co-executive producers for the film. The band Grizzly Bear scored the film.