Muhammadu Buhari is a Nigerian politician who served as the president of Nigeria from 2015 to 2023. A retired Nigerian army major general, he served as the country's military head of state from 31 December 1983 to 27 August 1985, after taking power from the Shehu Shagari civilian government in a military coup d'état. The term Buharism is used to describe the authoritarian policies of his military regime.