Zac Elawar from Capsule Computers wrote:

The ‘Assassin’s Creed’ film adaptation has landed a screenwriter, though it’s not anyone you will likely be familiar with.

According to THR, New Regency and Ubisoft have hired British playwright Michael Lesslie to script the movie. Lesslie has no feature-film experience on his resume, although he has written and made many short films and is highly acclaimed in his homeland for his brilliant efforts in penning the play Prince of Denmark, which was performed at the Cottesloe (National Theatre) in London in 2010. (Assassin's Creed, Industry)