Sean O'Keefe is an American record producer, mixer, and engineer based in Chicago, IL. Sean is best known for his work with Fall Out Boy, Hawthorne Heights, 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 (band), Punchline, and Spitalfield. Sean is also a musician. He is a former member of Chicago band This Is Me Smiling, in which he played the drums.