In a few years Sinéad O’Sullivan transplanted herself from Armagh to Belfast, to Strasbourg, to Atlanta, to Harvard Business School in Boston. But the move to Harvard, she says, was “the biggest culture shock I think I’ve ever experienced”. “We’re all speaking English, but it’s a different type of English, a different type of vocabulary, different ways of communicating and doing things that I had just never really come across before,” O’Sullivan told me on The Currency podcast this week, adding: “It was fascinating and interesting and intimidating and challenging.” O’Sullivan was there to learn. One of the most important…