Who is Guatemala's president and until when does he govern?

Bernardo Arévalo has been president since Jan 15, 2024, with a term the Constitution sets as a 'non-extendable period of four years' (art. 184), to January 2028, and an absolute ban on re-election (art. 187);… art. 188 refers the inauguration date to the Electoral and Political Parties Law. His inauguration survived attempts to overturn the 2023 election result through the courts (the Public Prosecutor's Office under Consuelo Porras against Movimiento Semilla); the Constitutional Court upheld the transition. The source is encyclopedic with references from major press outlets.