Prof JM Kyambi attended the University of Heidelberg for his under-graduate studies from 1962-68 and later joined the University of Giesen for post-graduate training from 1970 to 1975. He worked at the hospital of sick children in Cologne from 1975 to 1976. Upon his return to Kenya in January 1978 he joined the Dept of Surgery of the University of Nairobi at Kenyatta National Hospital (KNH) campus and he immediately embarked on the establishment of Paediatric Surgery as a surgical sub-specialty. Prof.Ambrose Wasunna was at the time the Chairman of the Department of Surgery.
He identified two suitable General Surgeons as the first trainees as paediatric surgeons. These were Dr.Nelson Wachira who he sent to the Great Ormond Children's Hospital in London and later to Manchester and Dr.James Muturi Ndungu who he sent to Manchester. The third was the late Dr.Gilbert Anangwe who first trained under him at the KNH before being sent to Liverpool to train under Dr.David Lloyd. Prof.J.Kyambi also recruited Dr.Svetlana Barrack from the KNH pool of medical officers and trained her locally. He also later trained Dr.Andreas Safwat.
After attending a scientific conference in Durban South Africa, he decided to visit the Redcross Children's Hospital in Cape Town in search of more training opportunities for his team and Dr.Fred Kambuni (1996)and Dr.Joel Lesan were the first beneficiaries of this initiative.
Prof.Kyambi is the founder president of the PanAfrican Paediatric Surgeons Asssociation (PAPSA) which was founded by him and others in Nairobi in 1994. He also started an exchange programme with his american colleagues under the auspices of Surgical Aid to Children of the World. The local chapter which he formed was called Surgical Aid to Children of Kenya and through it he organised for some of the world's best trainers in Paediatric Surgery to come to Kenya. These were; Prof.John Duckett, Prof.Gerald Manford (France) and Prof.Aberto Pinya (USA), He is currently part of the faculty of the Department of Surgery of the University of Nairobi in the Paediatric Surgery thematic area.