Andrew Berls is a Ruby and JavaScript developer who lives in Santa Barbara, CA. He has developed dashboards for www.causes.com using D3.js to visualize social networks and recently acted as a reviewer for Data Visualization with D3.js Cookbook, Packt Publishing. Andrew recently completed his degree in Computer Science at the University of California, Santa Barbara. When he's not programming, you can find him attempting to cook or hiking up a mountain.

Andrew regularly blogs about web technologies at http://www.andrewberls.com.

Simon Heimler is currently studying and working as a research assistant at the University of Applied Research in Augsburg in the field of Semantic Content Management. He has a degree in Interactive Media and over a decade of experience with web design and development.

Lars Kotthoff is a postdoctoral researcher at University College Cork, Ireland, where he uses artificial intelligence methods to make software faster and better. When he is not researching ways to make computers more intelligent, he plays around with JavaScript visualizations. He has extensive experience with D3.js.

Nathan Vander Wilt is a freelance software developer. He offers clients a wide range of expertise, including everything from creating HTML5 and native application interfaces to developing low-level control software for embedded and wireless systems. He especially enjoys solving problems such as peer-to-peer syncing or the many challenges of digital cartography. In order to stay sane in the suburbs, Nate also enjoys raising plants, fish, snails, honeybees, chickens, and rabbits with his family.