Data Innovators

Published on November 28th, 2012 | by Daniel Castro


Five Q’s on Data Innovation with Bill Day

Bill Day is the platform evangelist for RunKeeper, a Boston-based start-up that helps users track and obtain their fitness goals. I asked Bill to share with me his thoughts on how data is changing how people exercise, work towards fitness goals, and monitor their health.

Castro: As a runner myself, I am a huge fan of RunKeeper. Can you tell me how RunKeeper got started?

Day: One of our founders, Jason Jacobs, was training for a marathon and realized that there had to be a better way to track and understand his training and performance than the very limited options available at the time. He pulled together a small team to build an iPhone app to solve that problem, and the timing was great as we were able to launch in the very early days of the App Store.

Castro: RunKeeper recently launched the Health Graph platform. Can you explain what that is?

Day: The Health Graph provides an open platform for health and fitness data portability, available for free to developers everywhere. It allows users to bring all aspects of their health and fitness into a common repository for understanding how the different things they are doing including exercise, nutrition, sleep, and more affect their health. There are currently more than 100 partners who have launched apps, sensors, and services integrated with the Health Graph and millions of RunKeeper users with Health Graph accounts who can take advantage of those interconnections.

Castro: What kind of apps and use cases do you expect to see with the Health Graph platform over the next few years as new (and cheaper) sensors become available?

Day: We expect sensors to become ever cheaper and more “invisible” to consumers, a part of the background fabric of our devices, environments, clothes, etc. As they do, the need for a common platform to make sense of the tremendous rise in data about our health becomes ever more important. We see people tracking and correlating all kinds of interesting things about themselves via the Health Graph, and not just those things supported via the platform today (see for more on the API and what it enables now). We believe a bottom-up, consumer centric approach will revolutionize health and fitness for millions of people as they suddenly have the data and tools to make sense of what’s going on inside their own bodies in a way never before possible.

Castro: How has the availability of more data changed how people work towards their health and fitness goals?

Day: Data exposes both where you are at, and whether your assumptions and choices have been working for or against you, very plainly. As people get data about their health, and more importantly as they have systems and apps such as RunKeeper to help guide them in understanding and using that data to make better choices, they are dramatically empowered to improve their own wellbeing. Data enables proactive avoidance of health problems. This is a complete revolution versus the reactive, fix-what’s-wrong-now approach that’s traditionally been taking by the healthcare industry and medicine.

Castro: What kind of features should we expect next from RunKeeper?

Day: This year we’ve done a lot of work to help our community connect their fitness activities and other health data with their friends. Expect to see us take that interconnectedness even further as we build out the personal trainer in your pocket!

“5 Q’s on Data Innovation” is part of an ongoing series of interviews for Data Innovation Day by ITIF Senior Analyst Daniel Castro. If you have a suggestion for someone who should be featured, send an email to Daniel Castro at

About the Author

Daniel Castro is the director of the Center for Data Innovation and vice president of the Information Technology and Innovation Foundation. Mr. Castro writes and speaks on a variety of issues related to information technology and internet policy, including data, privacy, security, intellectual property, internet governance, e-government, and accessibility for people with disabilities. His work has been quoted and cited in numerous media outlets, including The Washington Post, The Wall Street Journal, NPR, USA Today, Bloomberg News, and Businessweek. In 2013, Mr. Castro was named to FedScoop’s list of “Top 25 most influential people under 40 in government and tech.” In 2015, U.S. Secretary of Commerce Penny Pritzker appointed Mr. Castro to the Commerce Data Advisory Council.Mr. Castro previously worked as an IT analyst at the Government Accountability Office (GAO) where he audited IT security and management controls at various government agencies. He contributed to GAO reports on the state of information security at a variety of federal agencies, including the Securities and Exchange Commission (SEC) and the Federal Deposit Insurance Corporation (FDIC). In addition, Mr. Castro was a Visiting Scientist at the Software Engineering Institute (SEI) in Pittsburgh, Pennsylvania where he developed virtual training simulations to provide clients with hands-on training of the latest information security tools. He has a B.S. in Foreign Service from Georgetown University and an M.S. in Information Security Technology and Management from Carnegie Mellon University.

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