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History Arc was started in 1978 by then - Carleton University Professors Christopher Levenson , Michael Gnarowski and Tom Henighan .
 Carleton University, Christopher Levenson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Carleton University, Christopher Levenson