268237
Carroll Milton Williams ( December 2 , 1916 in Oregon Hill , Richmond , Virginia - October 11 , 1991 in Watertown , Massachusetts ) was an American zoologist known for his work in entomology and developmental biology -- in particular , metamorphosis in insects , for which he won the George Ledlie Prize .
 Carroll, Williams
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Carroll, Williams