"In recent years, some English critics have claimed that Damien Hirst and his fellow young British artists have made London the new center of the advanced art world. As Hirst reaches the age of 40, this paper uses auction results to measure the importance of the YBAs compared to their American...

"New longitudinal data on individuals linked across nineteenth century U.S. censuses document the geographic and occupational mobility of more than 75,000 Americans from the 1850s to the 1920s. Together with longitudinal data for more recent years, these data make possible for the first time...

"Orson Wells made Citizen Kane, his greatest movie, when he was 25 years old; Frank Lloyd Wright designed Fallingwater, his most famous house, when he was 70. Contrasts as great as this raise the question of whether there is a general explanation of when in their lives great innovators are most...