As of my last update, there is no widely recognized artist by the name of Philippe Tassier with a detailed biography readily available in the standard references for art history. It's possible that the name may be associated with a lesser-known or emerging artist, or there could be a spelling error or confusion with another artist. The field of art is vast, with countless artists from various periods and regions, and not all are well-documented in the most accessible art historical resources. If Philippe Tassier is a contemporary artist, information might be found through art galleries, exhibitions, or a personal website dedicated to their work. In art history, many artists gain recognition posthumously or later in their careers, and documentation or scholarship about their work can emerge over time. If you have more specific details about the artist's medium, nationality, or the period they were active, it might help in identifying them or providing relevant information about their contributions to the art world.