From Halopedia, the Halo wiki
Esko Korpijaakko is a human archaeologist in the team that dug up the Forerunner facility on Coral as part of the Orion Archaeological Expedition. He has a wife, Carrie, and a son, Oscar. Before Coral's destruction, he wrote a letter to his wife detailing his work.
Korpijaako's given name and surname strongly indicate that he is of Finnish ancestry.