Grégoire Vuilleumier, also known as Greis (b. 1978 in Lausanne) is a Swiss rapper. Next to his solo career Greis is also a member of the rap band PVP, Chlyklass as well as Rogue State Alliance. He has received the Swiss Hip Hop Music Award as best solo artist multiple times and in 2010 MTV awarded him with the European Music Award as best Swiss artist.