381446
He then clerked for D.C. Circuit Judge David Bazelon and Supreme Court Justice William J. Brennan , Jr. Post subsequently earned a Ph.D. in History of American Civilization from Harvard University , worked briefly in private practice , and started his career in law teaching at Berkeley Law in 1983 .
 David Bazelon, William J. Brennan , Jr. Post, Harvard University, Berkeley Law
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 David Bazelon, William J. Brennan , Jr. Post, Harvard University, Berkeley Law