Gerald Joseph Mulligan, also known as Jeru, was an influential American jazz musician renowned for his work as a baritone saxophonist, composer, and arranger. A leading figure in cool jazz, Mulligan achieved lasting recognition for his light, melodic saxophone style and innovative arrangements. He collaborated with jazz greats like Miles Davis, Claude Thornhill, and Stan Kenton, and led a groundbreaking piano-less quartet with Chet Baker in the early 1950s. Mulligan's compositions, including "Walkin' Shoes" and "Five Brothers," have become jazz standards.