Susan C. Ostrowski has joined Troy Corporation as director of biocide products marketing USA.      Ms. Ostrowski began her career as a research associate and held positions as plant engineer, production supervisor and technical sales rep at EI Dupont De Nemours & Co., Inc. She then accepted the position of product manager at BASF Corporation in Mount Olive, NJ, where she also was product marketing manager, business director and vice president sales and marketing. She consulted at Diamond ...