Who serves as the spokesperson of the European Parliament?

Jaume Duch Guillot serves as the spokesperson of the European Parliament, making this answer correct. His role involves communicating important information about the Parliament's work, activities, and decisions to the public and the media. This position is crucial for ensuring that the activities and the decisions made by the Parliament are clearly understood and conveyed to citizens across the European Union, thereby facilitating transparency and accountability.

The other individuals mentioned have distinct roles within the European Union but do not serve as the spokesperson for the European Parliament. Eric Mamer, for instance, is an important figure in the EU's communication strategy but is associated with the European Commission. Ursula von der Leyen is the President of the European Commission, involved in broader executive functions of the EU rather than specifically acting as a spokesperson for the Parliament. Mariya Gabriel has been involved in areas related to education and innovation but does not hold the position of spokesperson for the European Parliament either. This differentiation helps clarify the specific responsibilities of each individual within the EU's institutional framework.