DIED. Nikos Psacharopoulos, 60, artistic director of the Williamstown (Mass.) Theater Festival; of colon cancer; on St. John, V.I. A Yale drama professor and Broadway director (the 1988 revival of A Streetcar Named Desire), Psacharopoulos made Williamstown, which he helped to found in 1955, the beloved summer camp of the American stage. Dozens of top actors earned a pittance for the pleasure of performing the classics without commercial pressures.