Which author was an American dramatist whose novel The Death of a Salesman won the Pulitzer Prize during Post-Modernism period?

There is an error in your question. Arthur Miller was an American dramatist whose novel Death of a Salesman won the Pulitzer Prize for Drama in 1949. However, Post-Modernism is a period in literature and art that emerged in the second half of the 20th century, whereas Miller's play belongs to the mid-20th century and is considered a work of Modernist literature.