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our team

David Gallagher, Executive Director

With an MSc (SOAS) in Sustainable Development, David has travelled extensively and has worked in International Development for over 40 years, mainly in the non-government sector - CUSO (Latin America), OXFAM (Africa and the Caribbean) and CARE (Balkans). He now works as an independent consultant on programme development, participatory evaluation and institutional proposal writing.

As former Chair of the Board, David is now Executive Director, responsible for the overall strategy and programming of Aerosan. 

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Archana Shrestha, Program Manager (Nepal)

Archana has both a degree and a Masters in Environmental Science and has worked for the past 6 years in the WASH sector. Her specific interests are in the fields of water, sanitation, climate mitigation and sustainable development.

Her responsibilities with Aerosan Sustainable Sanitation Nepal include:

  • research activities aimed at creating information for evidence-based policy
    and planning in the area of public toilets.

  • evidence based advocacy for change in public policy with the help of research
    findings through consultation meetings, workshops and conferences.

  • dissemination of knowledge, findings and information about urban sanitation
    through reports, proceedings and educational workshops.

  • technical assistance in demonstration projects regarding environmentally and
    economically sustainable public toilets in the urban area of Kathmandu Valley.

  • plan and assist in capacity development through trainings and workshops for
    community members, government officials and toilet operators.


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Dianna Marini,  Program Manager

With a BSc in Cell Biology & Psychology and MSc Bioresource Engineering (McGill), Dianna draws on the disciplines of health, environment and social sciences to tackle complex problems. She has over six years of experience as an intrapreneur across various B2B industries, specializing in strategy and project management. Dianna is passionate about applying the social business model approach to address current health and environmental challenges. 


As Program Manager for Aerosan, Dianna is responsible for overseeing and planning the implementation of Aerosan's various projects, which integrate technological and business solutions to achieve social impact at scale. She also assists in communications and the development of strategic partnerships with the Aerosan Team. 

IN MEMORIAm for prakash amatya

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Photo from Dianna Marini (4) copy 2_edit

Prakash Amatya, former Country Representative (Nepal) &    C.E.O Aerosan Sustainable Sanitation Pvt. Ltd.

Prakash Amatya passed away too soon in September 2022. He will be sorely missed by all at Aerosan. He was recognized in the community in Nepal for his work in capacity building and knowledge transfer. He was also an advocate for the migrant and underprivileged urban community. Prakash had a diverse educational background holding a major in Microbiology, Environment and Business Management. He was experienced in promoting rainwater harvesting and freshwater conservation and approached environmental issues from the perspective of the needs and limitations of businesses, municipalities and non-profit organizations.

Upon contributing to the development of urban water supply and sanitation policies that benefit the impoverished, Prakash worked on promoting awareness and compliance for sanitation policies in urban development. This enabled him to further his professional competence in the field of urban community development in order to improve the livelihood and dignity of waste workers in the Kathmandu Valley. Prakash also played an instrumental role in establishing the Freshwater Action Network in South Asia (FANSA) and continued to advocate at the regional and international level. Prakash continued to pursue his expertise in WaSH and urban development to find workable solutions for today’s problems. His professional background, inspiring leadership, optimism and personal humility earned him a great reputation in the field.

As country representative of Aerosan in Nepal, Prakash oversaw and managed local resources for program implementation. Prakash was the Chief Executive Officer of Aerosan Sustainable Sanitation Pvt Ltd, a social enterprise established in Nepal to implement the Aerosan HUB model.

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