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Mike Portnoy was born on April 20, 1967. He is an American drummer, songwriter, and record producer. Portnoy is best known for his work with the progressive metal band Dream Theater, which he co-founded in 1985. He was the band's drummer for 25 years, from 1985 to 2010. Portnoy has also played with other bands, including Liquid Tension Experiment, OSI, and Transatlantic.