Jeffrey Patrick Kaiser (born July 24, 1960) is an American former Major League Baseball pitcher. Kaiser attended Aquinas High School in Southgate, Michigan where he was teammates with Paul Assenmacher. He played college baseball at Western Michigan University, winning a school record 25 games. He pitched parts of seven seasons in the majors for five teams between 1985 and 1993. He never pitched more than 15 games or 16.2 innings in a major league season. He finished his career with an ERA of 9.17 in 50 games.

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