Dr. Lewis is a Distinguished User Experience Researcher at MeasuringU. He has published influential papers on the assessment of perceived usability and sample size estimation for usability studies and has product experience in the design and evaluation of user interfaces (graphical, spoken, mobile), including having been the lead interaction designer for the product widely regarded as the first smart phone, the Simon. He is on over 90 US patents and has over 100 publications. His books include Practical Speech User Interface Design (2011), Quantifying the User Experience (with Jeff Sauro, 2nd ed., 2016), and Using the PSSUQ and CSUQ in User Experience Research and Practice (2019). In 2021 he was inducted into the Academy of Medicine, Engineering, and Science of Florida.