HallStar: named David L. Rosenberg- er director, corporate development. In this new position, he will support global growth opportunities for existing products, new technologies and potential acquisitions. Mr. Rosenberger served more than 28 years at Dow Chemical in a number of critical business development roles. Most recently, he held the position of vice president, corporate development, for a start-up company in California, that marketed catalyst technology to the life sciences, specialty c...