Conversation so far:
Where was mark born?
The second of three children born to bank manager Tony Taylor, and his wife Judy.
when was he born?
CANNOTANSWER.
Where did he go to school?
Completing his secondary education at Chatswood High School.
Did he go to college?
he later obtained a degree in surveying at the University of New South Wales.

Question: when did he graduate?
Self-contained rewrite: when did Mark graduate?