Visual effects supervisor Matt Johnson discusses his work on Mary Poppins Returns and how his collaboration with Cinesite Montréal was a huge part of making the success of the movie in this Art of VFX interview 

Can you tell us more about your collaboration with their VFX supervisors?
I work very closely with the vendors from all the companies, often with daily cineSyncs. Christian Kaestner from Framestore Montréal, Kyle McCulloch from Framestore London, and Christian Irles from Cinesite Montréal were a huge part of making the success of the movie. Christian often visited me on set to help out whilst we were shooting.