Gregory Sorensen will become the CEO of Siemens Healthcare operations in the U.S. and Canada, effective June 1. He will succeed Randy Hill, who has served as interim CEO and was previously the COO for the U.S. healthcare organization. Sorensen is a practicing neuroradiologist and researcher. And his research and techniques are used by a number centers worldwide in Phase II and III trials of novel oncology agents, such as gene therapy, according to a company release. Siemens' release