Aggrey writes for the the Nation on Kenya's Foreign Relations and diplomatic affairs as well as regional humanitarian issues. Occasionally, he writes on politics in Kenya. . He studied communication and media technology at Maseno University. He joined the Nation Media Group upon graduation in 2009.
In 2010, he went through the Nation Media Group journalism training programme, the Media Lab. He holds Masters degree in Diplomacy from the Institute of Diplomacy and International Studies.