Colin Harmon might claim to be one of the best-selling Irish business authors of all time, if only he could nail down the numbers. Harmon, best known as one of the leaders of Ireland’s quality coffee revolution, has recently released his second book.  The first one – What I Know About Running Coffee Shops – sold a lot of copies since its launch in 2017. For an Irish non-fiction author, selling 5,000 books is considered a breakout success, even with the backing of a major publishing house. Harmon – who has self-published, self-marketed and self-distributed both of his books –…