Full List: Chief of staffs to Nigeria President from 1999 till date
Abdullahi Mohammed ( CoS to OBJ and Yar’Adua )
Gbolade Osinowo ( CoS to Yaradua )
Mike Oghiadomhe ( CoS to Jonathan )
Jones Arogbofa ( CoS to Jonathan )
Abba Kyari ( CoS to Buhari )
Non has been as powerful as Kyari, they were little known to public, because the chief of staff is only powerful when the president makes him so.
Abdullahi Mohammed was the longest serving CoS, he served 2 president yet he was not popular or powerful as Abba Kyari of today ,he was in villa for 9 years. He served as Chief of Staff to Obasanjo and late Yar’Adua and you won’t find him in any controversy
Even Anyim Pius Anyim who was Senate President before he became Secretary to Government of Federation (SGF) under Jonathan was not powerful like Kyari