Duke Pearson had an interesting career. Most people aren't aware of him, but he was truly one of the founding fathers of modern jazz. He played with many of the legends, notably Cannonball Adderley, Art Farmer, Benny Golson, Donald Byrd. He led several bands, including a big band he headed with Donald Byrd. He influenced many younger jazz musicians in his role as A&R man for Blue Note in its heyday.
He is credited with numerous compositions, but none is more popular than Jeannine. It is a catchy tune that sounds moderately difficult, but not impossible. Two things make this song more difficult than it sounds: 1) The tempo -- Pearson typically took it very fast, perhaps 225, and 2) the key -- it is in Ab minor (concert), which is 7 flats !!! You have to do a lot of practice to be fluent in 7 flats at 225.
This arrangement is a little slower (190 BPM) but it is true to the original key. Some people play this in more familiar keys, such as C minor.