The Bull-Joseph Fourier prize 2015 has been awarded to Victorita Doléan, Pierre Jolivet, Frédéric Hecht, Frédéric Nataf, Pierre-Henri Tournier for their work on ultra-fast medical diagnosis of brain aneurysms by means of new medical imaging technologies. Their work was supported by the French ANR grant MEDIMAX. The second prize was awarded to Antoine Levitt, researcher at INRIA, for his work on optimization of the performances of software dedicated to molecular modeling in order to create new materials and to practically proceed to "material by design".