What did the professor learn in Italy?

The professor was delighted to learn how to make the best coffee in the world. He tried every single variation Robbie the Barista showed him. Later, when he learned to brew them all himself, he tried all of his own samples.

ProfOnCafeineAUG2016_2©TimHupkes

‘It was a hoot,’ the professor says, looking back. ‘I drank so much coffee, it kept me up for four straight nights. Never before have I found so many answers as when I first learned how to make good coffee! Time was abundantly available. Of course I slept for three days in a row, after the effects of the cafeine had worn off.’

Who is this Robbie fellow who taught the professor how to make coffee?