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Lev Vygotsky , who created the foundation of cultural-historical psychology , based on the concept of mediation , published six books on psychology topics during a working life which spanned only ten years .
 Lev Vygotsky
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:
 Lev Vygotsky