Sensient Technologies Corporation announced that Dr. Gordon Hering, vice president, marketing and technology, has been elected an officer of the company by its Board of Directors.      Dr. Hering joined Sensient in September 1994 as a senior research scientist. He has initiated, developed and finalized successful new products, both market-driven and customer-driven. In April 2007, he was appointed to his present position.      Dr. Hering completed his post-doctoral training at Oxford Univers...