Guinness is the most iconic beer in the world. In 1759, Arthur Guinness signed a 9,000 year lease on the site of St. James's Gate brewery in Dublin. The lease is not valid in the modern day because the brewery has expanded beyond the original 4-acre site, and consequently bought out the property. Ten years after establishment, Guinness exported his ale for the first time, when six and a half barrels were shipped to England. The business expanded by adopting steam power and further exporting to the English market. On the death of Benjamin Guinness, his son Edward sold 65% of the business on the London Stock Exchange. The company pioneered several quality control efforts and hired the statistician, William Sealy Gosset in 1899, who achieved lasting fame under the pseudonym "Student" for techniques developed for Guinness. Because of the Irish Free State's "Control of Manufactures Act" in 1932, the company moved its headquarters to London later that year. Guinness brewed its last porter in 1974. In 1983 a non-family chief executive, Ernest Saunders was appointed and arranged the reverse takeover of the leading Scotch whisky producer distillers in 1986. The company merged with Grand Metropolitan in 1997 to form Diageo plc, although, the Guinness family still owns 51% of the brewery. Today, over 10 million glasses of Guinness are enjoyed every day, all over the world.