Conversation so far:
What was matthew's early career like?
he obtained a naval appointment through the influence of Tennessee Representative Sam Houston, a family friend, in 1825, at the age of 19.
What did he achieve?
CANNOTANSWER.
What was his early life like?
He was born in 1806 in Spotsylvania County, Virginia, near Fredericksburg; his parents were Richard Maury and Diane Minor Maury.

Question: What did he do after obtaining naval appointment?
Self-contained rewrite: What did Matthew Fontaine Maury do after obtaining naval appointment?