79827
The terms were used at least as early as 1958 by Ludwig von Bertalanffy and popularized by Timothy Leary in 1961 , and became widely accepted by researchers in psychedelic therapy .
 Ludwig von Bertalanffy, Timothy Leary
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:
 Ludwig von Bertalanffy, Timothy Leary