Yoav "Koolfox" Landau (born on April 4, 1992)  is an Israeli music producer who specializes in electro-rock . He combines elements of electronic dance genres with rock music influences to produce content for his YouTube channel. 
Landau joined Twitter in 2008 and began uploading content to his The Living Tombstone YouTube channel in 2011. His lyrical content is based on personal experiences as well as movies, shows and video games. He is from Tel Aviv, Israel . He worked with Mark Fischbach on a video called "Markiplier Rock Opera with Project RnL."