The below map is out of date but it gives one a sense of the breadth of Goldman’s reach. It has expanded since this map was created. For instance Mark Carney the Governor of the Bank of England is a Goldman alum.
One of the most interesting things about Mr. Barroso taking this job is how annoyed the pro-Europe people are with him. Goldman was anti-Brexit, so Barosso coming on board to help negotiate Brexit for Goldman is sand in the wounds of Brussels and Co.