Question: Who is the longest serving president in the world?
Disambiguated questions and answers: question: Who is the current longest serving president in the world including time as prime minister?
Who is the current longest serving male president in the world, based only on presidency?
Who is the longest serving female president in the world ever?
Who is the current longest serving male president in the world ever, based only on presidency?
answer: President of Cameroon
Paul Barthélemy Biya'a bi Mvondo
Paul Biya
Teodoro Obiang Nguema Mbasogo
Obiang
President of Equatorial Guinea
Vigdís Finnbogadóttir
President of the Republic of Iceland
President of Iceland
Teodoro Obiang Nguema Mbasogo
Obiang
President of Equatorial Guinea
Natural Questions answer: Paul Biya (from the Wikipedia article "List of current longest ruling non-royal national leaders")