Which preposition to use with promotor

from Occurrences 1%

Characteristic of adorers from the United States, where people always temper enthusiasm with usefulness, were a number of portfolios, their bindings much worn by time, containing railroad shares, land titles, stocks in enterprises of varying stability, suggesting the rambles of the American promotor from the prairies of Canada to the pampas of the Argentine.

of Occurrences 1%

On Tso Tsung-t'ang see G. Ch'en, Tso Tung T'ang, Pioneer Promotor of the Modern Dockyard and Woollen Mill in China, Peking 1938, and Yenching Journal of Soc.

Which preposition to use with  promotor