Jonathan first toured with Journey as part of their opening act during the 1980 Departure Tour. The group was called "The Baby's" and was headed by John Waite. Journey founding member, keyboard player and original lead singer, Gregg Rolie chose Jonathan as his replacement when he decided to leave Journey after the 1980 Departure Tour.
Jonathan cowrote every song for the "Escape album and helped Journey receive stratospheric success with the "Escape" and "Frontiers" albums, as well as "Raised On Radio". Jonathan and Steve Perry became great friends and wrote almost every Journey song together beginning in 1981 and endiing in 1997.
Jonathan has also been involved with other bands throughout his career including "Bad English" with Neal Schon, and his ex-wife's, Tane´ Cain, music career.