The late Mwakisunga accepted a call to serve as Africa Secretary of the Geneva based Lutheran World Federation (LWF), Department of Church Cooperation, for 13 years up to 1985.
Alipomaliza mashomo yake alirudi kufundisha katika shule alikotoka ambapo aliteuliwa kuwa Mkuu wa Chuo hicho hadi mwaka 2002 alipopokea wito kufanya kazi FMKD kama Katibu wa Afrika katika Idara ya Misioni na Maendeo Oktoba 2010. Aliteuliwa kuwa Mkurugenzi wa Idara hiyo 2010 hadi Julai 2013.