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A pioneer in the field , and inspired by Karl Popper 's and Warren Weaver 's works , Nobel prize economist and philosopher Friedrich Hayek dedicated much of his work , from early to the late 20th century , to the study of complex phenomena , not constraining his work to human economies but venturing into other fields such as psychology , biology and cybernetics .
 Karl Popper, Warren Weaver, Friedrich Hayek
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:
 Karl Popper, Warren Weaver, Friedrich Hayek