Frank Bentley is a Principal Researcher at Yahoo in Sunnyvale, CA where he leads User Research for Communications Products at the company. He has over 17 years of experience in the mobile industry, including 12 years as a Research Scientist at Motorola Labs. Frank's work investigates ways in which mobile devices can help strengthen strong-tie social relationships and how people can interact with large personal informatics data sets about their lives. He takes projects from early conceptual studies through to prototyping, field evaluation, and product as a routine process. Frank also co-teaches a course at MIT and on EdX called "Mobile Application Experiences," which was one of the first mobile application courses starting in 2006, and Stanford's CS377U: Understanding Users.