Haraldur Sigurdsson is emeritusprofessor of Oceanography at the University of Rhode Island. He has worked on research in the field of volcanology for over forty years, with studies on volcanoes in his native Iceland, North and South America, Caribbean, Indonesia, Italy and Africa, as well as on submarine volcanoes. He first visited Santorini (Thera) in 1975 as a member of the oceanographic expedition that studied the fallout from the Minoan eruption in the Bronze Age. His studies on the violent explosive eruptions of Krakatau in 1883 and Tambora in 1815 have strong parallels to the Thera eruption in the Bronze Age. During the 1975 Thera expedition the URI research vessel R/V Trident carried out sediment sampling of the sea floor east of Thera in order to determine the fallout pattern of air-borne volcanic ash from the great Minoan eruption. He was also editor in chief of the Encyclopedia of Volcanoes, also published in 1999. He was awarded the Coke Medal of the Geological Society of London in 2004.