Guillermo is CEO of S.A. La Nación. He started his professional carreer in the telecom industry. 

In 1994 he joined Telecom Argentina to develop and lauch its mobile operations. 

From 2000 to 2003, he was Regional Marketing VP at AT&T Latinoamerica for Brazil and Argentina, managing many launches in the region. He then joined Telecom Personal as CEO until finally joining S.A. La Nación in 2014. He currently leads a team of journalists and business professionals seeking to transform a traditional media group into a new media company with a strong Smart & Social vision.