biography of his namesake George Washington which he expected to be his masterpiece. Five volumes of the biography were published between 1855 and 1859. Irving traveled regularly to Mount Vernon and Washington, D.C. for his research, and struck up friendships with Presidents Millard Fillmore and Franklin Pierce. He was elected an Associate Fellow of the American Academy of Arts and Sciences in 1855. He was hired as an executor of John Jacob Astor's estate in 1848 and appointed by Astor's will as first chairman of the Astor Library, a forerunner to the New York Public Library. Irving continued to socialize and keep up with his correspondence well into his seventies, and his fame and popularity continued to soar. "I don't believe that any man, in any country, has ever had a more affectionate admiration for him than that given to you in America", wrote Senator William C. Preston in a letter to Irving. "I believe that we have had but one man who is so much in the popular heart". By 1859, author Oliver Wendell Holmes Sr. noted that Sunnyside had become "next to Mount Vernon, the best known and most cherished of all the dwellings in our land". Irving died of a heart attack in his bedroom at Sunnyside on November 28, 1859, age 76—only eight months after completing the final volume of his Washington biography. Legend has it that his last words were: "Well, I must arrange my pillows for another night. When will this end?" He was buried under a simple headstone at Sleepy Hollow cemetery on December 1, 1859. Irving and his grave were commemorated by Henry Wadsworth Longfellow in his 1876 poem "In the Churchyard at Tarrytown", which concludes with: Legacy Literary reputation Irving is largely credited as the first American Man of Letters and the first to earn his living solely by his pen. Henry Wadsworth Longfellow acknowledged Irving's role in promoting American literature in December 1859: "We feel a just pride in his renown as an author, not forgetting that, to his other claims upon our gratitude, he adds also that of having been the first to win for our country an honourable name and position in the History of Letters". Irving perfected the American short story and was the first American writer to set his stories firmly in the United States, even as he poached from German or Dutch folklore. He is