Denis Sassou Nguesso
Africa's longest serving leaders: Mugabe, Biya and others
Zimbabwe's former president Robert Mugabe, whose death was announced on Friday, was in power for 37 years but is far from the only African leader to have ruled for so long.
Leadership is knowing when it’s time to pass the baton
When we talk about leadership it is often about one rising to the occasion or preparing oneself to assume a specific leadership position.