Sigmund Esco "Jackie" Jackson ( May 4, 1951) is a member of the Jackson 5. He is the second child and is the oldest of the Jackson brothers.

Aspired to become a professional baseball player, those plans changed when father Joseph Jackson formed a band with Jackie and his brothers. Jackson performed with a high tenor singing voice. He added brief parts in some of the Jackson 5's hit singles, including "I Want You Back" and "ABC". In 1973, he released a solo album that failed to chart. 

Jackson has been married three times and has four children. 

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