Eric Mansfield has 20 years of development experience at some of the world's largest media and entertainment conglomerates—including Sony Music, Universal, Scripps, Sony Pictures, and MTV—that brings a detailed, practical approach to building high-quality applications. He has been an early adopter of the Spring framework and has a passion for clean, user-friendly design and doing things right the first time. He lives in Austin, Texas with his wife and enjoys golfing and playing the piano.

Justin Rodenbostel is a senior software architect with Redpoint Technologies, based in Chicago, Illinois. He has more than 12 years' experience in full-stack application development using a variety of technologies, including Spring, Grails, Rails, .NET, and various JavaScript frameworks. On the Web, he can be found blogging at http://justinrodenbostel.com. Apart from his work, he stays busy as a husband and father of three, and when he's lucky, can be found brewing beer in his garage.

Ernst Schmidt is a designer and frontend engineer with a focus on rich web applications. He has worked with Sencha frameworks from the very beginning and has an in-depth understanding of Ext JS internals and architecture.

Recently, he is working with Sony Music and Universal Music Group leading the design and implementation of user interface frameworks for digital supply chain applications.

He lives in the Bay Area with his wife and two sons.

Alexandre Arcanjo de Queiroz, a Brazilian software developer, graduated from the Faculty of Technology of São Paulo, a renowned institution of his country. He has experience in developing backend and frontend applications using the Java EE platform in the Unix environment. He is also a GNU/Linux user.

Currently, he is working in Indra Company, a Spanish multinational company present in more than 128 countries, developing applications for the telecommunications segment.