Our Team

GroundWork’s core team provides the majority of technical support to clients. GroundWork also has an extensive roster of public health experts that can be enlisted to meet the needs of each project. With the language skills of our core team, we are able to work in English, French, Spanish and Portuguese.


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Fabian Rohner, PhD

Fabian Rohner is an international nutrition and public health specialist, focusing on the design and management of impact evaluations and M&E plans for large-scale food fortification and infant and young child nutrition projects. Fabian has conducted clinical trials related to the prevention and treatment of malaria, helminths and micronutrient malnutrition, and has conducted multiple national micronutrient surveys. He is an expert in iron and iodine deficiencies, and served on the iodine expert panel of the NIH-led BOND (Biomarkers of Nutrition for Development) initiative. He has worked on projects in Azerbaijan, Bangladesh, Burkina Faso, Chad, Côte d’Ivoire, Ethiopia, Ghana, India, Indonesia, Kenya, Mali, Morocco, Niger, the Philippines, Senegal, Sierra Leone, Tanzania, Uganda, and Vietnam. He is currently based in Hanoi, Vietnam.

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James Wirth, MA

James Wirth is an international nutrition specialist, focusing on the design and management of nutrition/food security surveys, research on the determinants of stunting, and performance measurement and data reporting systems. James has managed qualitative program evaluations related to food security and food fortification, and has also conducted research on humanitarian response and disaster risk reduction. He has worked in Azerbaijan, Bangladesh, Dominican Republic, Ethiopia, Ghana, India, Jordan, Kenya, Mozambique, Sierra Leone, Tanzania, Uganda, Vietnam, and Zambia. James is currently based in Geneva, Switzerland.

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Nicolai Petry, PhD

Nicolai Petry is a human nutrition and agriculture specialist, focusing on biofortification programs and the impact of biofortified staple crops on human health. Nicolai has conducted several clinical trials with focus on mineral bioavailability from foods and the development of chronic diseases. He conducted multiple trials in Rwanda investigating iron bioavailability from biofortified beans, and has supported large-scale micronutrient survey projects in Azerbaijan and Sierra Leone. He has authored quantitative and qualitative reviews and manuscripts related to iron biofortification, the implementation of orange-flesh sweet potato programs in Africa, food consumption and dietary-intake from biofortified food in Africa and Asia, and salt iodization in Ethiopia. He has worked on various projects in Ethiopia, Kuwait, Rwanda, Sierra Leone, and Switzerland. He is currently based in Zurich, Switzerland.

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Doreen Gille, MSc

Doreen Gille is a human biologist with expertise in consumer behavior assessment and scientific project management, related to -omics techniques. Her research focus is on foods and their influence on human health and disease with regards to acute molecular changes occurring after their consumption. She supports GroundWork in accounting, contracting, and corporate management support. Doreen is based in Zurich, Switzerland and speaks German, English and French.

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Rita Wegmüller, PhD

Rita Wegmüller is an international nutrition specialist focusing on micronutrient interventions and their efficacy and safety in relation to neglected tropical diseases in low-income countries. Rita has conducted research related to iron and zinc deficiency with a focus on the collection of dietary intake data, the development of novel food fortification products, and the investigation of micronutrient absorption and efficacy in clinical trials in areas with a high-burden of infectious diseases. She also monitored clinical drug trials in sub-Saharan Africa. She has worked in Angola, Burkina Faso, Congo, Côte d’Ivoire, Gambia, Iran, Malawi, Morocco, Switzerland, Tanzania, and Thailand. She is currently based in Basel, Switzerland.

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Tina Wilson

Tina Wilson has over 20 years of experience providing contract management, accounting, and project support to International Organizations in Switzerland. From 2012 to 2016, Tina served as GroundWork’s head of administration and accounting, and currently provides GroundWork with technical advice related to bookkeeping and accounting. She based in Canberra, Australia, and speaks English and French.


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Ibironke Olofin MBBS, ScD, MPH

Ibironke Olofin is a researcher with training in epidemiology and background as a physician. She examines the effects of nutritional interventions and nutrition-related exposures on the health of pregnant women, infants and young children. She also investigates the potential role of agricultural interventions and other nutrition-sensitive interventions in solving the nutritional problems of women and children in developing countries. She collaborates with GroundWork to conduct systematic reviews, meta-analyses and synthesis of evidence related to nutritional interventions. She is currently based in Boston, USA.

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Bradley Woodruff, MD MPH

Bradley Woodruff is a physician and epidemiologist. He worked at the U.S. Centers for Disease Control and Prevention (CDC) for 20 years from 1987 to 2007. During his CDC career, he assisted UN agencies and non-governmental organizations by providing nutrition and health assistance to persons affected by humanitarian emergencies, and supervised a team of CDC epidemiologists and nutritionists who carried out national nutrition surveys. As a consultant, Dr. Woodruff supported national surveys in Bangladesh, Georgia, Mongolia, the Philippines, and the United Arab Emirates, and researched the association of household food security and child malnutrition in Uganda, and the effectiveness of supplemental feeding in Ethiopia and home fortification in China. He currently serves as a Senior Epidemiology and Public Health consultant to GroundWork, and has provided survey design and data analysis support to nutrition surveys in Azerbaijan, Burkina Faso, Côte d’Ivoire, India, Sierra Leone, and Zambia. He also led a quantitative analysis project investigating the determinants of stunting reduction in Ethiopia. He is currently based in Victoria, Canada.