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Early " concept " artists like Henry Flynt ( 1940 – ) , Robert Morris ( 1931 – 2018 ) , and Ray Johnson ( 1927 – 1995 ) influenced the later , widely accepted movement of conceptual art .
 Henry Flynt, Robert Morris, Ray Johnson
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:
 Henry Flynt, Robert Morris, Ray Johnson