Chemical Engineer · Systems Scientist · Food Systems Researcher

Engineering equitable food futures from the ground up

Engineer and systems scientist applying soil biogeochemistry and food systems modelling to deliver equitable outcomes—from smallholder farms in Kenya to pastoral catchments in the Waikato. Fluent in English, Spanish and Swahili.

Dr Dorisel Torres-Rojas
Dorisel presenting at an international conference
Presenting on sustainable food systems and soil science
About

Kia ora. Hola!

I'm Dori—an engineer, systems scientist and researcher from Puerto Rico, now based in Aotearoa New Zealand. I grew up bilingual in a multi-ethnic country, spent nearly a decade working through kitchens in California, then took that same drive into science. I have a chemical engineering degree, an MSc and PhD in soil science with minors in international development and mechanical engineering, and deep expertise in synchrotron spectroscopy.

I use that training to solve problems that matter—connecting molecular-scale soil chemistry to the food systems and communities that depend on it. I currently lead the Gates Foundation–funded Kenya food systems project at the Riddet Institute's Sustainable Nutrition Initiative, adapting New Zealand's KAMA national food systems model for the Kenyan context.

I invest deeply in the communities I work with. Whether co-creating food system models with Kenyan stakeholders, working with farmers in the Waikato, or mentoring students, the point of the science is the people it serves.

376+ citations

Publications spanning soil biogeochemistry, pyrogenic organic matter, nitrogen cycling and sustainable food systems.

Trilingual · Three continents

English, Spanish and Swahili. From Puerto Rico through California kitchens to Cornell, the Waikato and now Kenya—always community-facing.

Project Lead — Gates Foundation Kenya programme

Leading the US$2M Gates Foundation–funded project adapting NZ's KAMA food systems model for Kenya, in partnership with ILRI.

Research

What I work on

Presenting Kenya food systems modelling with SNi and ILRI

Sustainable Food Systems — Project Lead

Project Lead on the Gates Foundation–funded Kenya food systems programme, co-created with the International Livestock Research Institute (ILRI). Adapting New Zealand's KAMA national food systems model for Kenya—building evidence-based tools for food policy transformation.

Soil Organic Matter & Surface Chemistry

Probing molecular-level interactions between soil organics, minerals, solutes and gases using synchrotron NEXAFS spectroscopy and advanced surface techniques. Understanding how nutrients transform at mineral–organic interfaces.

Nitrogen Cycling & Biochar

Investigating how pyrogenic organic matter retains reactive nitrogen through covalent bonding—with implications for fertiliser development, ammonia pollution control and agricultural emissions reduction.

Kenya Interactive Food System Model (KeIFSM) stakeholder workshop
Gates Foundation–funded Kenya food systems programme stakeholder workshop — in partnership with ILRI
Journey

Career path

2024 – present

Senior Research Officer

Sustainable Nutrition Initiative (SNi), Riddet Institute, Massey University

Project Lead on the Gates Foundation–funded Kenya food systems programme, co-created with ILRI. Adapting New Zealand's KAMA national food systems model for the Kenyan context to support evidence-based nutrition policy.

2019 – 2024

Lecturer & Researcher

University of Waikato, Environmental Research Institute

Research on pastoral systems, nutrient management and environmental chemistry. Denitrifying bioreactor systems for agricultural nitrogen removal. Part of Louis Schipper's research group.

2012 – 2018

PhD Soil Science

Cornell University — Lehmann Lab

Minors in International Agriculture & Rural Development and Mechanical Engineering. NSF Fellow in Food Systems and Poverty Alleviation, working on sustainable energy and food security with smallholder farming communities in western Kenya.

2008 – 2011

MSc Soil Science & International Development

Cornell University — Lehmann Lab

Soil Science with a minor in International Agriculture & Rural Development. Molecular-level investigation of nutrient transformations between soil organics and mineral surfaces—combining fundamental chemistry with a commitment to equitable agricultural outcomes in the Global South.

2005 – 2007

BSc Horticulture

University of Puerto Rico – Mayagüez

Bridging engineering foundations with applied plant and soil science.

~2000 – 2005

California Kitchens

Various restaurants, California

Nearly a decade working through kitchens—building a practical understanding of food systems before returning to university.

1995 – 2000

BSc Chemical Engineering

University of Puerto Rico – Mayagüez

Foundation in process engineering, thermodynamics and systems thinking that continues to inform a quantitative approach to soil and food systems research.

Research team and collaborators
With research colleagues in Aotearoa New Zealand
Selected Publications

Key contributions

Covalent nitrogen bonding to pyrogenic organic matter provides a persistent ammonia sink
Hestrin R, Torres-Rojas D, Dynes JJ, Hook JM, Lehmann J et al.
Nature, 2019
Nitrogen speciation and transformation in fire-derived organic matter
Torres-Rojas D, Hestrin R, Lehmann J et al.
Geochimica et Cosmochimica Acta, 2020
Biochar–soil interactions: effect on plant growth and nutrient availability
Deng L, Torres-Rojas D, Burford M, Whitlow T, Lehmann J, Fisher E
Environmental Science & Technology, 2020
CO₂ priming of biochar enables high ammonia retention via covalent bond formation
Krounbi L, Enders A, Torres-Rojas D, Lehmann J et al.
Environmental Science & Technology, 2020
Constant carbon dosing of a pilot-scale denitrifying bioreactor to improve nitrate removal from agricultural tile drainage
Moghaddam R, Barkle G, Rivas A, Torres-Rojas D, Schipper L
Ecological Engineering, 2022

Full publication list on Google Scholar · ORCID: 0000-0002-1343-9907

Let's connect

If you'd like to discuss food systems, soil science, community-engaged research or potential collaborations, I'd welcome hearing from you.