Mateo works as an Assistant to the Executive Team at GSI, where he assists the Managing Partner, the Managing Director, and the Secretary General on daily organizational and administrative matters.

Prior to joining GSI, Mateo worked in project coordination roles in the fields of executive education as well as conflict management. His areas of interest are environmental politics (especially transboundary water management) as well as international security.

Mateo holds a Master in International Affairs graduate from the Hertie School and a Bachelor in Ethics, Politics and Social Thought from Bard College Berlin.