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The technique - as invigorating as it was unorthodox - was later adopted by cartoonists such as Walt Kelly [ " Pogo " ] and Garry Trudeau [ " Doonesbury " ] " , wrote comic strip historian Rick Marschall .
 Walt Kelly, Garry Trudeau, Rick Marschall
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Walt Kelly, Garry Trudeau, Rick Marschall