The president of the Federal Republic of Nigeria is the head of state and head of government of the Federal Republic of Nigeria. The president of Nigeria is also the commander-in-chief of the Nigerian Armed Forces. The president is elected in national elections which take place every four years. The offices, powers, and titles of the head of state and the head of government were officially merged into the office of the presidency under the 1979 Constitution of Nigeria. The current president, Muhammadu Buhari, took office on May 29, 2015, as the 15th president of the Federal Republic of Nigeria.
Nigerian Presidential web site: https://statehouse.gov.ng/