 Giannakopoulos and his brother, Pavlos, were the owners of the pharmaceutical corporation Vianex, which was founded in 1924, by their father, Dimitrios Giannakopoulos, as a small local import and distribution firm.Vianex currently manufactures and markets, in Greece and elsewhere, a variety of products, in collaboration with leading international firms.The company reported net sales of €240.2 million euros in 2012.