LEXINGTON, Mass.--(BUSINESS WIRE)--Synta Pharmaceuticals Corp., a biopharmaceutical company focused on discovering, developing, and commercializing small molecule drugs to treat severe medical conditions, today announced three appointments to its senior management team. Art McMahon has been named Vice President of Human Resources, Andrew Sonderfan has been appointed Vice President, Pre-clinical Safety Assessment and Rob Kloppenburg has joined the Company as Vice President, Investor Relations and Corporate Communications.