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Sigurdur Helgason is credited with pioneering the " hippie airline " , Icelandair , that made low-cost air travel to Europe possible for generations of Americans Born July 20 , 1921 , in the Icelandic capital , Reykjavík , Sigurdur Helgason came to the United States in his 20s and graduated with a business degree from Columbia University in New York in 1947 .
 Sigurdur Helgason, Icelandair, Reykjavík, Sigurdur Helgason, Columbia University
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sigurdur Helgason, Icelandair, Reykjavík, Sigurdur Helgason, Columbia University