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Sean O'Keefe is an American record producer, mixer, and engineer based in Chicago, Illinois, United States. O'Keefe is best known for his work with Fall Out Boy, Hawthorne Heights, Til Morning and Plain White T's, but has also worked with artists such as Motion City Soundtrack, The Hush Sound, Less Than Jake, Company of Thieves, Punchline, Spitalfield, and You vs Yesterday. O'Keefe is also a musician. Wikipedia