Marianna worked at Motu as a research analyst for the policy components of Motu’s research programmes, in particular for the Nutrient Trading and Water Quality project. She also had responsibility for communications and the Motu Research and Education Foundation.
Marianna has a Master of Arts in Linguistics from Victoria University of Wellington. Her thesis considered social and regional factors in New Zealand English speech sounds.
In 2010 Marianna started work at the New Zealand Treasury as a policy analyst in the infrastructure unit.