Yamaguchi Naotaka is Resident Representative of the Japan International Cooperation Agency (JICA) in Guatemala.

Prior to joining JICA he served as a researcher at Global Environmental Forum in Japan and devoted in Project World Heritage. He covered all the UNESCO World Heritage sites in South America and India for conservation.

In JICA he worked at several departments in Tokyo headquarters. He has experiences as a resident official in Bolivia and Dominican Republic.

Before coming to Guatemala, he was a Division Chief of Planning at JICA Research Institute and managed a series of research projects including joint research projects with the Policy Dialogue at Columbia University, the Brookings Institution and the Center for Strategic and International Strategies (CSIS).

He teaches Modernization of Japan at Istmo University in Guatemala. He studied at Keio University in Japan and holds M.A. in economics.