Four times selected the Swedish Chef of the Year, Dahlgren ran the Stockholm restaurant Bon Lloc, which had one Michelin star, from 1996 to 2005. In 2007 he opened the restaurant Mathias Dahlgren in the Stockholm Grand Hôtel, which received a Michelin star in 2008. In 2009, it was upgraded to two Michelin stars, only the second Swedish restaurant ever (the first one being Edsbacka krog) to receive this recognition. The side restaurant Matbaren in the same building was simultaneously elevated to one Michelin star status. Also he is placed as a newcomer (2009) on place 50 among the best restaurants in the world.