Conversation so far:
What started Billy Joel's solo career?
Billy Joel signed a contract with the record company Family Productions with which he recorded his first solo album, Cold Spring Harbor.
Where was Cold Spring Harbor?
Cold Spring Harbor is a town on Long Island
What was Billy Joel's debut album called?
Billy Joel's debut album was called Cold Spring Harbor.
Who helped Billy Joel begin his solo career?
Artie Ripp states that he spent US $450,000 developing Billy Joel

Question: Where did he know him from
Self-contained rewrite: Where did Billy Joel know Artie Ripp from?