The build-up of the debt burden began in the 1980's under the Socialist Prime Minister Andreas Papandreou:
The default of 2012 (aka 'Private Sector Involvement') didn't help much:
Defaults are rather common on the recent Greek history:
Just by the way, the artificial, euro-induced credit boom didn't really help Greece either. Credit bubbles tend to be followed by busts in the least suitable moments:
A white male with some professional experience in finance and investing.