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Chesterton employs the conceit of Francis as a jongleur , a medieval tumbler , and bids us imagine Francis as someone who sees his world upside down . " Dr. Clark is an internationally recognized leader in the field of operational ocean observing systems , and is well regarded within NOAA as someone who gets things done . While each essay represents an important intervention in American historiography in itself , the collection taken as a whole reveals Kessler-Harris as someone who has always pushed the field of American history to greater levels of inclusion and analysis , and who continues to do so today .