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doubled its question values in 2001 and lifted its winnings limit in 2003 , which one year later allowed Ken Jennings to become the show 's first multi-million dollar winner ; it has also increased the stakes of its tournaments and put a larger focus on contestants with strong personalities .
 Ken Jennings
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:
 Ken Jennings