Lambo (1923–2004), trained at the University of Birmingham, returned to Nigeria in 1954 and was appointed Medical Superintendent of the Aro Mental Hospital, Abeokuta. The hospital was over-capacity, custodial in design, and unable to admit anything like the catchment population.
Lambo's intervention was institutional rather than pharmaceutical. He arranged with the four villages surrounding Aro — Lantoro, Igbein, Iberekodo and Ijaiye — for patients to be lodged with village families during the day, returning to the hospital for clinical sessions, ECT (then standard practice), and overnight observation only as needed. Family members were trained to accompany patients and to participate in their care.
The model used the village's existing social architecture as the long-term support structure that European psychiatry tried (and frequently failed) to construct *de novo*. Length of stay fell sharply. Re-admission rates were comparable to or better than European long-stay institutional figures. Patient outcomes, measured by return to work and family stability, were measurably better.
The WHO adopted the Aro Village model in its 1972 monograph on community-based mental health, and recommended it as a template for low-resource settings — one of the very small number of African clinical-services innovations to receive that recognition. Lambo became the WHO's Deputy Director-General from 1973 to 1988.
Inside Nigeria, however, the model was never replicated at the other federal psychiatric hospitals (Yaba, Calabar, Enugu, Kaduna). The Aro site itself remains a working psychiatric hospital under the Federal Neuropsychiatric Hospitals system; the village-integration component has eroded with urbanisation around Abeokuta.