He spent eight years with Jacquesson, with his work taking him beyond accountancy as he went on the road around Europe testing the market and assessing criticism from wine sellers and customers. He learned about composition and taste so that by 1840 he already seems to have been blending Champagne for at least one other house. In 1841 he married Emma-Anne Jaunay, the daughter of a French hotelier based in London's Leicester Square, and an English mother. The following year their son, Paul Krug, was born. In 1842 came the move to Reims and, following a year of negotiations, Krug et Cie. was founded in 1843 with sleeping partner Hyppolite de Vivès. Joseph was also fluent in French, English and German and spoke some Russian, putting the company in position to exploit key overseas markets.