Given the question: What key details about david easton can be extracted from the following bio? Bio: david easton -lrb- june 24 , 1917 july 19 , 2014 -rrb- was a canadian-born american political scientist . easton , who was born in toronto , ontario , came to the united states in 1943 . from 1947-1997 , he served as a professor of political science at the university of chicago . at the forefront of both the behavioralist and post-behavioralist revolutions in the discipline of political science during the 1950s and 1970s , easton provided the discipline 's most widely used definition of politics as the authoritative allocation of values for the society . he is renowned for his application of systems theory to the study of political science . policy analysts have utilized his five-fold scheme for studying the policy-making process : input , conversion , output , feedback and environment . gunnell argues that since the 1950s the concept of '' system '' was the most important theoretical concept used by american political scientists . the idea appeared in sociology and other social sciences but it was easton who specified how it could be best applied to behavioral research on politics . during his career he has served as a key gatekeeper , as consultant to many prominent organizations and funding agencies , and author of numerous influential scholarly publications . he has served on many boards and committees and was president of the american political science association .
The answer is:
- known for is political systems theory- death date is 19 july 2014- birth date is 24 june 1917- name is david easton- image is davideaston.jpg- birth place is toronto , ontario