Conversation so far:
What were the changes in the 90s to REO Speedwagon?
By the late 1980s, the band's popularity was starting to decline.
Why did Alan Gratzer leave REO Speedwagon?
Original drummer Alan Gratzer left in September 1988 after he decided to retire from music to open a restaurant.
Why did REO Speedwagon lose popularity?
Kevin Cronin stated I think that fame and the riches that come with it can also bring out the demons in people.“
Did any other changes occur to REO Speedwagon besides Alan Gratzer leaving?
In early 1989, Gary Richrath quit.

Question: Why did Gary quit
Self-contained rewrite: Why did Gary quit?