Bill has always been passionate about software engineering (30 years). And just as passionate to understand how humans interact with software. For a long time he couldn’t decide if he was an engineer or a designer. He finally gave up trying to classify himself and just decided to live in both worlds as much as possible.

Bill is currently VP, Business Engineering at PayPal (Retail, Merchant and Online Payments). Previously he led UI Engineering at PayPal and did the same at Netflix and Meebo (where he also led user experience). He is co-author of the O’Reilly book Designing Web Interfaces and a regular conference/workshop speaker on topics on all aspects of design & engineering. Previously he has consulted for startups and fortune 500 companies, co-wrote one of the first JavaScript Ajax libraries, launched the design pattern library at Yahoo! and wrote one of the first games for the Macintosh in 1985.