Final answer:
The architect of the Woolworth Building, the former world's tallest building, which stood from 1908 to 1968, was Cass Gilbert.
Step-by-step explanation:
The architect of the 47-storey office building commissioned by Frederick Bourne, which served as the headquarters of his company and was the tallest building in the world from 1908 to 1909, was Cass Gilbert. This iconic building, known as the Woolworth Building, was demolished in 1968 and at the time was the tallest building ever to be demolished. When constructed, the Woolworth Building utilized advanced steel-frame construction techniques, soaring to 57 stories and standing at 792 feet, holding its title as the world's tallest building until the construction of the Chrysler Building in 1930.