Conversation so far:
What happened in 1977 to Journey the band?
Journey's album sales did not improve and Columbia Records requested that they change their musical style and add a frontman, with whom keyboardist Gregg Rolie could share lead vocal duties.
Why did Journey the band change their musical direction by adding a frontman, with whom keyboardist Gregg Rolie could share lead vocal duties?
Journey hired Robert Fleischman and made the transition to a more popular style, akin to that of Foreigner and Boston.
What was Robert's role with the band Journey?
lead singer
Did Journey the band release any new albums?
Journey released their fourth album, Infinity
Did Infinity by Journey the band do well?
That album was Journey's first RIAA-certified platinum album.
Did the album Infinity by Journey have any hit singles?
with their hit song Wheel in the Sky, Journey set on a new path with a more mainstream sound to make their highest chart success to date.
What else did you find interesting after Journey set on a new path with a more mainstream sound to make their highest chart success to date?
In late 1978, manager Herbie Herbert fired Dunbar, who joined Bay Area rivals Jefferson Starship shortly thereafter.

Question: Why did he fire him?
Self-contained rewrite: Why did Journey's band manager Herbie Herbert fire Dunbar?