From the 1960s until its collapse in 1977, he worked as a clerk and legal draftsman with the Assembly of the East African Community.
During his time as foreign minister, he helped contain a conflict with Rwanda and soothed relations with the Democratic Republic of the Congo, Burundi, and Sudan.
After making the accusation, Wasieba claimed that he had received death threats and hired armed guards.
Several days before he died, Wapakhabulo wrote to President (and long-time friend) Yoweri Museveni, opposing the lifting of term limits outside those prescribed by the constitution.
He was a recipient of Uganda's Nalubaale Medal for civilian activists who had assisted during the guerrilla war.