Since 1997, Actelion Pharmaceuticals has been researching, developing and marketing new treatments for a variety of critical healthcare needs. The Switzerland-based company, which has a subsidiary in the Sierra Point area of South San Francisco, caters to a global market and works on medications and treatments for a range of diseases that are often not highly publicized, like pulminary arterial hypertension. This location is a research and development facility and is not open to the public, but contact information can be found on Actelion's website (see link above).