The decisive step was made by Paul Giannakopoulos in 1960, with the establishment of the company Farmagian, which in 1971 became an SA and was renamed into Vianex.

By 1999, Vianex had acquired four modern factories in Athens and Achaia, while at Varympompi it had established its main offices and distribution centre of finished products.

Giannakopoulos took the reins of the company from his father Paul in January 2012 when he also became deputy chief executive officer, in addition to being the vice chairman of the board of directors of Vianex.

The new era of the company under the leadership of Giannakopoulos was associated with increased outreach and conclusion of important agreements, be them new ones or extension of existing ones.

"I handed over the reins of the largest Greek pharmaceutical industry in the country and I'm sure that one day he will also make it the largest one abroad" stated Paul Giannakopoulos in July 2013, on the occasion of the announcement of the collaboration between Vianex and Eli Lilly, for the production of the injectable antibiotic vancomycin at the facilities of Vianex and its 100% export in the Chinese market.

This organisation financially supports students, has programs against poverty, provides funding to the healthcare industry and to environmental projects, and strives to make education more accessible and to preserve the Greek culture.

[13] In 2016, in the OAKA locker room, he insulted Vassilis Spanoulis by wishing his son to die and was forced to apologize afterwards.