Onno Giller

Junior Researcher in Citizen Science


Onno Giller is an environmental anthropologist and has a specific interest in understanding how society and culture cope with, and adapt to climate change. He received his Bachelor’s degree in Environmental Science with Development Studies at the University of Sussex (Brighton, United Kingdom), and subsequently obtained his MSc in Development and Rural Innovation at Wageningen University and Research Centre (Wageningen, The Netherlands).

In 2014, Onno Giller joined the CGIAR Research Program on Integrated Systems for the Humid Tropics (Humidtropics) as a junior researcher at Wageningen University and Research Centre, working on understanding scaling processes of agroecology in Nicaragua. In 2015, he then moved within the Humidtropics programme to the International Institute of Tropical Agriculture (IITA), and was based in Burundi, and subsequently Uganda. Here he was part of research that was aimed at understanding the psychobehavioural and institutional barriers and catalysts in scaling processes (ex-post) of Banana Xanthomonos Wilt (BXW, an aggressive disease in bananas) control methods across Burundi, the Democratic Republic of Congo and Uganda.

Prior to joining IHE, he was based at IITA in Uganda within the CGIAR Program on Climate Change, Agriculture and Food Security, where he worked within the Cocoa and Coffee research team, focussing mainly on the coffee value chain. The main focus of his work there was on private sector engagement, where understanding coffee companies perceptions on climate change and how novel ideas from IITA and other knowledge partners could be integrated into their farmer outreach programmes. He also did a short project on the use of Photo Voice as a means of capturing coffee farmers’ perception of the impacts of climate change on their community.

Onno Giller joined IHE Delft in December 2019, and works within the Knowledge, Capacity and Development charigroup within the Integrated Water Systems and Governance Department.

Research Summary

At IHE Delft, Onno's current main work is on the Ground Truth 2.0 (GT2.0) project, which is a 3-year EU funded project that is setting up and validating six citizen observatories in real conditions, in four European and two African demonstration cases. Within GT2.0, Onno contributes to research on incentives and barriers to participating in citizen observatories, assessing the impact of citizen observatories, as well as contributing to various deliverables and outputs concerning the GT2.0 methodology. Among these outputs and deliverables, he assists with the coordination of the GT2.0 MOOC, which will serve as an introduction to the GT2.0 methodology, as well as validating the GT2.0 methodology across the 6 case studies as part of the impact assessment. As the GT2.0 project is wrapping up at the end of 2019, Onno is also assisting with the arrangements of Ground Truth 2.0 Week 2019, which aims to showcase the Ground Truth 2.0 project and the six citizen observatories across the different countries.

Alongside his role within GT2.0, Onno is active as the Uganda focal point for the Women and Water for Change in Communities project, which is using community based monitoring as a tool for empowerment and aims to promote women and youth as leaders, entrepreneurs and sustainability change agents in rural African communities. Onno also advises on communications for the Citizen Science Earth Observation Lab and AfriAlliance.


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