During his tenure at the head of a public holding company (from 1996 to 2001) he was the architect of privatisations of companies such as Repsol, CASA, Aceralia, Indra, Santa Barbara and Iberia, among others. After his departure from SEPI he was president of the Catalan cement company Uniland in 2003 and during his professional career he directed companies such as NH Hoteles, Abertis Telecom, Renta 4, Oesia and Vueling.

Born in Leon 67 years ago, Ferreras graduated in law from the University of Oviedo. He joined the state civil service for law in 1984, and practised in Barcelona until 1989, when he set up Ferreras legal and tax advisors professional office. He was secretary of the council for Iniciatives, the venture capital company belonging to the Generalitat and to Barcelona City Council, and then worked in the Ministry of Industry, with Josep Piqué.

In 1996 he was appointed president of Teneo, a branch of the defunct National Institute of Industry (INI). Ferreras disassembled this structure and incorporated all the inherited companies from the INI under the SEPI umbrella group, tasked with promoting privatisation within the framework of the strategy of reducing the presence of the state in the companies while promoting the revitalisation of the economy.

Ferreras, in addition to being a member of the UIC Barcelona CAU, was linked to the university world, since he was also a lecturer at the University of Leon.