FEATURE  •  WOMEN IN AGRICULTURE

A child of the Pare highlands who would grow up to reshape what grows across East Africa.

From the only Black woman in her American classroom to the breeder whose drought-proof sorghum now fills the brewing vats and grain stores of East Africa — Dr. Mary Mgonja spent half a century turning genetics into food security. This is the story of a scientist who refused the easy path.

By the Kilimokwanza Desk

Shengena Peak rises 2,462 metres above the Pare Mountains – the highest point in the range and the second-highest in Tanzania’s Kilimanjaro Region. From its summit, on a clear day, the view runs across Mkomazi National Park to the Taita Hills over the Kenyan border. And somewhere in the folds of those green slopes lies the village where Mary Mgonja was born- a child of the Pare highlands who would grow up to reshape what grows across East Africa.

Decades later, the crops growing in those same fields would carry her fingerprints — sorghum that shrugged off drought, maize hybrids priced for the poorest farmer, varieties bred not in a foreign laboratory but for the precise rhythms of the East African season. But in the beginning, there was only a young woman who decided that the hardest sciences were the ones worth doing.

Agricultural genetics and plant breeding in the 1970s were the domain of men. Mgonja walked in anyway. She has said women in professional spaces often had to be twice as good to earn the same recognition – so rather than choose a gentler discipline, she turned toward the most demanding ones: the molecular puzzles of crop improvement, the slow patient arithmetic of breeding a better seed.

The only one in the room

Her career began in the mid-1970s inside the Tanzanian civil service, where she worked as a cereals and legume agronomist and, briefly, as acting director of the Katrin Agricultural Research Institute. These were lean years of thin budgets and broken equipment – an early lesson that good science means little if it cannot survive contact with a real, underfunded research station.

To go further, she had to leave. Between 1981 and 1983 she studied for a master’s degree at the University of Arkansas in the United States. It was a brutal kind of solitude.

“When I went to the US to do my master’s, I was the only black person in my class, the only female, and the only foreigner. And I had two small children. I had a very hard time.”

She finished anyway, returned home, and took charge of Tanzania’s national rice breeding programme. Then, convinced that lasting food security demanded deeper genetic answers, she enrolled in a doctorate – a joint programme between the University of Ibadan and the International Institute of Tropical Agriculture in Nigeria. By 1990 she was Dr. Mgonja, plant breeder, ready for the work that would define her.

Keeping the lights on

The 1990s were no kinder to African public research. As economies tightened, the money for breeding programmes evaporated. Many scientists watched their work stall. Mgonja learned to write proposals.

It became one of her quiet superpowers. She brought in Tanzania Breweries to align barley breeding with industrial malting needs, pulled technical support from the International Atomic Energy Agency, used Sasakawa Global 2000’s demonstration networks to push improved varieties out to farmers, and leaned on the World Bank and a Japanese food-aid fund just to keep the laboratories running. The science survived because she refused to let the budget kill it.

She also noticed something maddening: excellent crop varieties bred in public labs were rotting on the shelf, blocked by slow, restrictive seed-registration rules. Appointed to Tanzania’s national variety release committee, she began arguing for faster pathways — a fight against bureaucracy that would follow her across the continent.

And remembering her own isolation in that Arkansas classroom, she co-founded and chaired the Tanzania Association for Professional Women in Agriculture and Environment, mentoring the next generation of women who would not, if she could help it, have to be the only one in the room.

Seeds without borders

In 1999 Mgonja stepped onto the international stage, joining ICRISAT – the research institute devoted to the world’s semi-arid tropics. For fifteen years she worked the dryland country of Southern and Eastern Africa, coordinating sorghum and millet networks and eventually serving as a deputy regional representative.

Her central insight was deceptively simple. Agro-ecological zones do not stop at national borders — so why should a sorghum variety, proven in one country, have to crawl through years of repeat trials in a neighbouring country with identical soil and rainfall? She campaigned for regional seed harmonization: register once, release across the trade bloc. Seeds, she argued, should travel as freely as the climates they were bred for.

Under this approach a roster of improved sorghums reached farmers’ fields — the early-maturing, drought-tolerant Macia; the Striga-resistant Wahi and Hakika; the high-yielding NARCO Mtama 1 and Sila bred for grain and livestock-feed markets.

When the beer industry switched to sorghum

One of her boldest interventions reached all the way into the brewing vat. For years the region’s commercial lagers depended on imported malting barley, a crop that kept failing when the rains did. Every failed harvest meant more precious foreign currency spent abroad.

Mgonja made the case for white-grained sorghum as a home-grown, climate-resilient substitute. The logic was irresistible: breweries saved foreign exchange, the nation kept its currency, and dryland farmers – people like Gasper Mrema near Moshi — suddenly had a commercial cash crop they could actually grow. Varieties like Macia and Gadam Hamam doubled as food in the granary and income at the market.

Seeds should travel as freely as the climates they were bred for.

At ICRISAT’s Nairobi hub she ran large competitively funded programmes – including a $1.8 million grant on crop-water productivity – and joined the Gates-funded Africa Biofortified Sorghum project, working to fold better nutrition into the varieties farmers already loved. Throughout, she mentored: PhD students like Phyllis Muturi, whose work decoded resistance to the stem borers that plague sorghum, and a wide web of collaborators developing hybrids at research stations in Kenya and running farmer-led variety selection in central Tanzania.

From the laboratory to the policy table

In 2013 Mgonja changed altitude again, becoming AGRA’s Country Director for Tanzania. The job was no longer about a single crop but about the whole machinery of the food system – seed, soil, storage, finance, markets.

She managed a portfolio of 96 grants worth more than $51 million, aiming the money at the chokepoints between a good harvest and a fair price. She coordinated a multi-million-dollar push under the SAGCOT corridor, stitching together input supply, grain aggregation and market access so that smallholders were not left selling cheap to middlemen.

Crucially, she aligned this work with Tanzania’s own banner programmes – “Big Results Now” and the Kilimo Kwanza, or “Agriculture First,” initiative – and pressed the government to take public-private partnerships seriously. Her own research from this period explained why so many farmers resisted improved seed: awareness alone was never enough. Without credit to afford the seed and demonstration plots to prove it worked, even the best variety stayed in the bag.

Building the seed company she always needed

Eventually she concluded that grants and public research could only carry the work so far. Real sustainability needed a business. In 2018 she co-founded Namburi Agricultural Company and became its Director for Technology and Communication -a scientist turned entrepreneur, building the domestic seed supply chain Tanzania had always lacked.

The problem she set out to solve was price. Imported hybrid seed cost far more than poor households could pay. By licensing public-sector maize hybrids and producing them at home — cutting out shipping and import duties — Namburi could sell certified hybrid seed at roughly half the price of imports, around $2 a kilo against $3 to $3.50 for imports.

The scale tells the story: hundreds of metric tons of seed a year, tens of thousands of farmers reached, and more than 40 regional demonstration fields where farmers could see for themselves how a protected hybrid outperformed the old varieties under the same sun and the same rain. She became, too, a forceful champion of plant variety protection — not as a barrier, she insists, but as the legal backbone that lets a breeder invest, and that shields farmers from counterfeit seed sold on false promises.

The long view

Today her reach extends to the continental stage — a seat on the AfricaSeeds governing board of the African Union, a place on the steering committee of the Technologies for African Agricultural Transformation programme, and a chair at high-level forums on food-systems transformation alongside the likes of former President Jakaya Kikwete.

How do you get a better seed into the hands of the farmer who needs it most?Her answer was never just genetics. It was genetics married to fair prices, sane regulations, honest demonstration plots and durable local enterprise. She connected the laboratory to the furrow — and in doing so helped build the more resilient food systems East Africa is still growing into.

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