Joseph Leslie Sample was an American jazz, Jazz fusion keyboardist and composer. He was one of the founding members of The Jazz Crusaders in 1960, the band which shortened its name to "The Crusaders" in 1971. He remained a part of the group until its final album in 1991 and also the 2003 reunion album Rural Renewal.

The Crusaders were an American jazz/jazz fusion group performing from the 1960s to the 2010s. The group was known as the Jazz Crusaders from their formation in 1960 until shortening their name in 1971. The Crusaders played a wide assortment of genres, including straight ahead jazz, urban R&B, R&B-based jazz, and the blues. The band reached a commercial apex in 1979 with their hit single "Street Life", featuring lead vocals by Randy Crawford, and their accompanying album of the same name.