Born in Pennsylvania, Pastorius grew up in Fort Lauderdale, where he played with visiting R&B and pop acts while still a teenager and built a reputation as a local legend. Everything started to come together for him quickly once he started playing with another rookie fusionmeister, Pat Metheny, around 1974. By 1976, he had been invited to join Weather Report, where he remained until 1981, gradually becoming a third lead voice along with Joe Zawinul and Wayne Shorter. Outside Weather Report, he found himself in constant demand as a sessionman and producer, playing on Joni Mitchell, Blood Sweat and Tears, Paul Bley, Bireli Lagrene and Ira Sullivan albums -- and his first eponymous solo album for Epic in 1976 was hailed as a tour de force. From 1980 to 1984, he toured and recorded with his own band, the innovative Word of Mouth that fluctuated in size from a large combo to a big band.
Alas, Pastorius became overwhelmed by mental problems, exacerbated by drugs and alcohol in the mid-'80s, leading to several embarrassing public incidents (one was a violent crack-up on-stage at the Hollywood Bowl in mid-set at the 1984 Playboy Jazz Festival). Such episodes made him a pariah in the music business and toward the end of his life, he had become a street person, reportedly sighted in drug-infested inner-city hangouts. He died in 1987 from a physical beating sustained while trying to break into the Midnight Club in Fort Lauderdale. Almost totally forgotten at the time of his death, Pastorius was immediately canonized afterward (Marcus Miller wrote the tune "Mr. Pastorius" in his honor, as have many others over the years).
Since Pastorius' death, there have been numerous posthumously released albums featuring previously unheard live and studio recordings. In 2015, the bassist was also the subject of the documentary film Jaco, produced by bassist Robert Trujillo (Suicidal Tendencies, Metallica) and Pastorius' oldest son John Pastorius IV.~ Richard S. Ginell