Del Marquis (born Derek Gruen on August 31, 1977) is an American musician and the lead guitarist for the American group Scissor Sisters. He is also the creator and producer of the American group Slow Knights.
Born in New York City, he was introduced to the Scissor Sisters in 2001 at the insistence of a friend who, at the time, was dating Jake Shears. He originally dismissed the band when he first saw them perform at The Cock, a New York City gay bar.
Gruen produced the DVD Kuvaputki released in 2008 by Embryoroom director Edward Quist about Finnish noise artists Pan Sonic.
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