Conversation so far:
what songs did Switzer produce?
CANNOTANSWER.
Whats so important about Switzer's personal life?
Switzer was getting into his car in front of a bar in Studio City, when a bullet smashed through the window and struck him in the upper right arm.
how did he overcome this tragedy?
The gunman was never caught.
when did this tragedy happen?
January 1958.
who is his family member?
Switzer and Collingwood got along well and married in Las Vegas three months later.

Question: who is collingwood?
Self-contained rewrite: who is collingwood to Carl Switzer?