Jasper "J.J." Johnson is a notable American jazz trombonist and composer, recognized for his contributions to the genre. Born on January 14, 1924, in Indianapolis, Indiana, he became a prominent figure in the jazz scene during the mid-20th century. Johnson was known for his innovative approach to the trombone, blending traditional jazz with modern techniques. Throughout his career, J.J. Johnson collaborated with many famous musicians, including Miles Davis and Dizzy Gillespie. He was also a key figure in the development of bebop and hard bop styles. Johnson's work has left a lasting impact on jazz, influencing many trombonists who followed him.