Little-known facts about Nairobi’s chief environment officer Geoffrey Mosiria
By David Nthua, September 24, 2025Geoffrey Mosiria is a man who is hated and loved with equal measure.
His name often features in news and blogs headlines, whether for his firm directives on public order, his involvement in environmental reforms, or his unexpected humanitarian actions.
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Education and career background
Mosiria is the current Chief Officer for Environment at Nairobi City County.
He studied business at the University of Nairobi, later earning a Master’s degree in Business Administration from the same institution.
Before moving into his current role, he worked in hospital administration at Pumwani Maternity Hospital, Mbagathi Hospital, Mutuini, and Mama Lucy Kibaki Hospital.
Under his oversight, Mbagathi Hospital established a Newborn Unit and a Neonatal Intensive Care Unit, while Mama Lucy and Mbagathi hospitals installed their first CT scan machines.
These steps were seen as part of wider reforms aimed at improving services in Nairobi’s health facilities.
Public directives and controversies
In his present position, Mosiria has drawn attention for the rules he has issued to matatu operators within the Central Business District.
He instructed them to keep their spaces clean, avoid loud music while inside the city centre, and stop shouting to attract passengers, instead urging them to use placards.
In addition to curbing noise pollution, Mosiria also announced a joint crackdown with the National Police Service to tackle violent robberies in the city centre.
His directives came at a time when operators were already protesting over parking space allocations, placing him at the centre of a contentious urban debate.
Beyond administration, Mosiria has also stepped into unexpected situations.
He recently rescued a man who had been living on top of a tree along Jogoo Road, a case that brought him both praise and criticism.
The incident highlighted Nairobi’s often unseen social struggles while also drawing attention to his readiness to intervene outside official boundaries.
Today, Mosiria is described as a reserved figure who rarely indulges in political posturing but still voices opinions on issues affecting daily life.
His approach continues to divide public opinion, with some viewing him as heavy-handed and others as simply enforcing order.
This dual perception keeps him firmly in Nairobi’s spotlight, ensuring his name recurs whenever debates on governance, service delivery, or public discipline emerge.