Matthew W. Foehr has been promoted to president and chief operating officer of Ligand Pharmaceuticals. Mr. Foehr previously served as executive vice president and chief operating officer. John Higgins, who had been serving as president and chief executive officer, will continue to serve as CEO.   Mr. Foehr has more than 20 years of experience in the pharmaceutical industry, having managed global operations and various R&D programs. Prior to joining the company in 2011, he was vice president ...