João Ferreira has a degree in Biology and a PhD in Ecology.

He is a member of the European Parliament since 2009.

In 2012 he became a member of the Central Committee of PCP and about a year later he became a councilor of the Lisbon City Council, after having been a candidate - head of the list - also by CDU.

Before arriving at the political lines, he held several positions related to the Faculty of Sciences of the University of Lisbon - member of the senate, member of the board of directors and member of the board of the students association.

He was also president of the Direction of the Association of Scientific Research Fellows and senior technician of the Intermunicipal Association of Water of the Region of Setúbal.