David Teller David is a User Experience Specialist, and has been a member of the User Experience Design team in Siemens Healthineers, Flanders, NJ for 10 years. As part of many design teams, his primary activities include, UX research, iterative usability testing and ensuring that medical devices are safe and effective. David has been working in the usability field for over 18 years. Prior to joining Siemens Healthineers, David worked as a usability engineer at Automatic Data Processing (ADP) and Intel. David completed his masters certificate in User Experience at Bentley College and holds both CUA and CXA from Human Factors International.