Silberline has named Joseph P. Dowd as its global president and COO. Mr. Dowd joined Silberline as executive vice president in 2001. He holds a bachelor’s degree in chemical engineering from the University of Virginia.      In his new position, Mr. Dowd will be responsible for directing all aspects of operational policies, objectives and initiatives. He shares responsibility for the aggressive and successful global growth of the company with Silberline CEO Lisa Scheller and members of the Silb...