James S. Mazzola has been appointed vice president, corporate communications and investor relations, Halozyme Therapeutics, Inc. He reports to president and chief executive officer Dr. Helen Torley.   Mr. Mazzola will be responsible for the creation and implementation of communication and branding efforts that support business objectives to key stakeholders, including investors, employees, media, corporate partners, patients, clinicians and the scientific community.   Mr. Mazzola has 25 years of...