Stephen "tWitch" Boss is a freestyle hip-hop dancer, choreographer, actor, producer and television personality who was the runner-up on So You Think You Can Dance in 2008. He appeared in films such as Step Up 3D, Step Up Revolution and Step Up: All In before joining The Ellen DeGeneres Show in 2014. On the show, Boss started as a DJ before becoming a co-executive producer and occasional guest host. Boss also appeared in Magic Mike XXL, as well as TV shows Dancing with the Stars, Ellen's Game of Games and Disney's Fairy Tale Weddings. Most recently, he can be seen as a judge on Season 17 of So You Think You Can Dance.