Sigmund Esco "Jackie" Jackson (born May 4, 1951) is an American singer best known as a founding member of the Jackson 5, for which he was inducted into the Rock and Roll Hall of Fame in 1997. Jackson is the second child of the Jackson family, and the oldest Jackson brother.

Sigmund Esco Jackson was born at St Mary's Mercy Hospital in Gary, Indiana, on his mother Katherine's 21st birthday in 1951. He was given the nickname Jackie by his grandfather, Samuel Jackson. He and his siblings (Michael, Marlon, Tito, Jermaine, Randy, Rebbie, La Toya, and Janet) were brought up in a two-bedroom house in Gary, Indiana, an industrial steel city south of Chicago. His father, Joseph "Joe" Jackson, worked at a steel mill, and at night he played in an R&B band called the Falcons with his brother, Luther. Their mother, Katherine, a Jehovah's Witness, played the clarinet and piano. His father formed the Jackson Brothers singing group, which included Jackie and his brothers Tito and Jermaine. Younger brothers Marlon and Michael played assorted percussive instruments.

By 1964, Joe made Michael the lead singer forming the Jackson 5, after Katherine discovered that Michael could sing. The brothers rehearsed every day after school under Joe's lead, keeping themselves busy and out of trouble. Joe saw that their talent could get them out of Gary. Jackie gives his mother credit saying "there wouldn't have been The Jackson 5 without her". Katherine used to sing harmonies with the brothers. Within two years, the group emerged professionally, signing with Motown in 1968. Before the group signed with Motown, Jackie wanted to pursue a career in professional baseball.

Jackie performed with a high tenor singing voice. He had the highest and lightest natural speaking and singing voice of all the brothers. He added brief lead parts in some of the Jackson 5's hit singles, including "I Want You Back" and "ABC". When the Jackson 5 became the Jacksons after leaving Motown for CBS Records in 1976, Jackson's role as a vocalist and songwriter increased. He added a lead vocal alongside Michael on their Top 10 Epic single "Enjoy Yourself", and also added composition on six of the group's albums with Epic. Jackson's voice changed to a lower tenor vocal style during the Epic years. One of his most successful compositions, "Can You Feel It", co-written with Michael, became an international hit in 1981. Jackson began performing more lead vocals as Michael pursued a solo career. On their 1984 album Victory, Jackie performed lead on the song "Wait" and wrote the single "Torture". Before the start of the Victory Tour in 1984, he suffered a knee injury during rehearsals. Jackie recovered well enough to perform on the last leg of shows in December 1984 in Los Angeles, where Michael announced he was leaving the group. In early 1985, Marlon left the group as well. Jackie, Tito and Randy became session musicians, vocalists and producers during this time. ...

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