PERSON@1 -LRB- NUMBER@1 April NUMBER@2 -- NUMBER@3 December NUMBER@4 -RRB- was an MISC@1 philosopher , prominent classical liberal political theorist , and sociological theorist of the MISC@2 era .

PERSON@1 -LRB- April NUMBER@1 , NUMBER@2 -- December NUMBER@3 , NUMBER@4 -RRB- was an MISC@1 philosopher ; prominent classical liberal political theorist ; and sociological theorist of the MISC@2 era .
