Conversation so far:
where was mike born?
Norristown, Pennsylvania.
what were the names of his parents?
Vince and Veronica.
how many siblings did he have?
is the second-oldest son.
what school did he attend?
Phoenixville Area High School.
when did he start playing baseball?
began encouraging his son to build his arm strength at the age of five.

Question: who trained him as he was growing up?
Self-contained rewrite: Who trained Mike Piazza in baseball as he was growing up?