J. Guillermo Guevara is a Salvadoran author and economist. He has worked at the University of El Salvador and has published several books on El Salvador's economy, history, and politics, including "Historia Económica de El Salvador" (Economic History of El Salvador) and "La dolarización en El Salvador" (Dollarization in El Salvador). His works often analyze the socioeconomic and political reality of his country from a critical perspective.