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It was taken up by Einar Haugen , who pioneered a form of linguistics which used the metaphor of an ecosystem to describe the relationships among the diverse forms of language found in the world , and the groups of people who speak them .
 Einar Haugen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Einar Haugen