MJM's most extensive work on behalf of a film has by far been our work on behalf of The Chronicles of Narnia-The Lion, The Witch & The Wardrobe. MJM began a consulting relationship with Walden Media in 2000, helping to develop a strategy that would bring the film to the widest audience possible just as Walden was beginning talks with the C.S. Lewis Estate. Believing that Disney was the best choice as a partner for the film, MJM's Mark Joseph brought the property to Disney Vice President Rick Dempsey who began to build support for the idea within his company. Before long, the two respective presidents of Walden and Disney were in talks over the property and soon consummated their unique arrangement.

MJM continued to work on Narnia related issues until 2005, including contacting artists who were interested in being on the film's soundtrack, reading the first draft of the script and providing coverage, working on early strategic marketing and branding proposals to position the property properly and providing early marketing and public relations work before filming had begun.