Sergio Pablos has been working in animation for a long time. He's a talented animator, who worked on a bunch of animated films (Tarzan, Treasure Planet, Despicable Me, The Smurfs). He and his team are currently hard at work on a new project, Klaus. This movie captured our attention thanks to its soft shadows and very interesting lighting. It looked incredibly soft for a 3d film, but apparently it's not actually 3D. The whole film is done in 2d, actually.
Sergio knew that he wanted to create something new in 2D animation, so he addressed Les Films Du Poisson Rouge to help the production team to develop a new tool for light and shadow. With its help the animation guys were able to give 2D animation an almost volumetric look.