Thomas Enebo is the co-lead of the JRuby project and an employee of Engine Yard. He has been a practitioner of Java since the heady days of the HotJava browser, and he has been happily using Ruby since 2001. Thomas has spoken at numerous Java and Ruby conferences, co-authored "Using JRuby", and was awarded the "Rock Star" award at JavaOne. When Thomas is not working he enjoys biking, anime, and drinking a decent IPA.

Charles Oliver Nutter has been programming most of his life, as a Java developer for the past decade and as a JRuby developer for over four years. As a JRuby Architect at Engine Yard, he co-leads the JRuby project, an effort to bring the beauty of Ruby and the power of the JVM together. Charles believes in open source and open standards and hopes his efforts on JRuby and other languages will ensure the JVM remains the preferred open-source managed runtime for many years to come. Charles blogs at blog.headius.com and tweets as headius on Twitter.

Jeff Casimir travels the world preaching the good word of Ruby for his company, Jumpstart Lab. He interacts with hundreds of developers and dozens of teams each year, pushing his research into best practices and new ideas.

Yoko is a dedicated programmer, blogger and, maybe, a nerd. She likes to code, read sources and learn new languages. Currently, Yoko is a committer of JRuby and Nokogiri project. When her API, RedBridge was merged to JRuby, she became a JRuby committer along with it in 2009. She became a Nokogiri committer in 2010 to help pure Java Nokogiri implementation to finish. Because JRuby and XML are Yoko's favorite technologies, it was a good fit. Before that, Yoko was a server side Java evangelist in Japan, and wrote three books about Java Servlet. After she had more than three years of blank in 2005-8, she's back to programming. Now, she enjoys days of happy coding.

Dr. Venkat Subramaniam is an award-winning author, founder of Agile Developer, Inc., and an adjunct faculty at the University of Houston.

He has trained and mentored thousands of software developers in the US, Canada, Europe, and Asia, and is a regularly-invited speaker at several international conferences. Venkat helps his clients effectively apply and succeed with agile practices on their software projects.

Venkat is the author of ".NET Gotchas," the coauthor of 2007 Jolt Productivity Award winning "Practices of an Agile Developer," the author of "Programming Groovy: Dynamic Productivity for the Java Developer" and "Programming Scala: Tackle Multi-Core Complexity on the Java Virtual Machine" (Pragmatic Bookshelf). His latest book is "Programming Concurrency on the JVM: Mastering synchronization, STM, and Actors".

Nathaniel T. Schutta is a senior software engineer focussed on making usable applications. A proponent of polyglot programming, Nate has written two books on Ajax and speaks regularly at various worldwide conferences, No Fluff Just Stuff symposia, universities, and Java user groups. In addition to his day job, Nate is an adjunct professor at the University of Minnesota where he teaches students to embrace dynamic languages.

Randall Thomas is a classically trained musician that took one too many calculus classes along the way and got sucked into the sciences. Being both blessed and cursed with a strange form of technology ADD, he's worked in various industries with numerous startups covering everything from robotics, to low level telecommunications & networking to applied computing for stock trading systems.

Randall is an internationally renowned speaker on practical data mining techniques and the business of startups.

When not glued to a computer Randall is likely lost in book or on a running trail wondering if he will get to the end of either.

Tammer Saleh is a long time Rubyist, leader, and published author.

As the happily former VP Engineering at Engine Yard, Tammer ran the development team and the flagship Cloud product. He authored the acclaimed book, Rails AntiPatterns with Chad Pytel. He's also the author of the Shoulda testing framework, and the fantastic Airbrake service.

Tammer has given classroom training in Ruby, Rails, JRuby, and Test Driven Development, and has spoken at various Ruby and Rails conferences around the world.

Previous lives include C/C++ AI programming, and UNIX administration for Citysearch.com and Caltech's Earthquake Detection Net work.

By day Sarah Allen is CEO of Blazing Cloud, a San Francisco consulting firm that creates innovative mobile products for hire, both web and native iOS/Android. By night, Sarah writes code for Mightyverse, which aspires to be a revenue generating product to help people communicate across languages and cultures. She's also working to change the face of software development with RailsBridge, and often teaches outreach workshops and kids. She created Pie, a open source language for kids to develop web adventure games.

Before her adventures in Ruby and mobile, Sarah has a history of developing leading-edge products, such as After Effects, Shockwave, Flash video, and OpenLaszlo. Sarah was named one of the top 25 women of the web by SF WoW (San Francisco Women of the Web) in 1998.

Sarah blogs at www.ultrasaurus.com.

Jim Remsik is a world-renowned hugger, conference organizer, community instigator, and speaker. He's been around the world from London to the Bay. He's a principal at Bendyworks a software consultancy in Madison, WI. Jim answers to "Tiger, Big Tiger, yo Tiger." But, what you should really know is he has been on Ripley's Believe it or Not, Raced Stock Cars Backwards and was ineffectively targeted by a serial killer in his youth. His talks draw on his wide range of life experiences and relate them back to how we can all become better people.

Nancy Lyons works at the intersection of technology, community, and people. She empowers and motivates teams of technologists and creatives as the President and CEO of Clockwork Active Media.

Together with Meghan they're the Geek Girls Guide, a duo dedicated to demystifying technology for audiences everywhere through extensive public speaking, writing, and online dialogue.

Meghan Wilker specializes in using strategy, technology, and process to bring people and products together. As VP, Managing Director at Clockwork Active Media she drives projects to produce engaging digital solutions.

Together with Nancy they're the Geek Girls Guide, a duo dedicated to demystifying technology for audiences everywhere through extensive public speaking, writing, and online dialogue.

Joe is a professional software consultant at Arcturo, where he builds Ruby and Rails applications for clients of all sizes. He also contributes to several JRuby projects including TorqueBox and Trinidad.

Joe is the author of the soon to be released "Deploying with JRuby" from the Pragmatic Bookshelf

Xavier recently emigrated from Australia to San Francisco to work with the analytics team at Square. Prior, he worked on large Ruby projects at The Conversation and ClearGrain, and presented a world tour of a training course titled "Your Database Is Your Friend". He has been working with Ruby for half a decade, and has published and contributed to over 80 open source projects according to GitHub.

LivingSocial Architecture Team member. Concurrent/Distributed Object Oriented Programming afficionado. JVM fan. Beer enthusiast. Karaoke fiend.

Andreas Ronge is the author of the Neo4j JRuby binding Neo4j.rb. When he does not work on this open source project or consult in projects using Neo4j.rb he practices the piano, currently the Brahms Piano Quartet in C minor. He is employed as a consultant at Jayway in Sweden since 2001.

David's technical management experience spans entertainment, media, and finance. Prior to joining Jun Group, David brought technology leadership and hands-on strategic and architectural direction to Gucci, TheStreet.com, and, most recently, Scripps Networks (Food Network, HGTV, DIY, Fine Living, and Great American Country).

At Jun Group, David and his team built the most advanced, flexible, and powerful social video network ever developed. As Chief Technology Officer, David is responsible for creating and maintaining the technology that delivers millions of opt-in video views across multiple devices, operating systems, and providers.

I've been a software developer for nearly 15 years with extensive experience in Java and OSGi. Ruby has been more of a hobby, but I've followed the JRuby project for quite some time, contributing as time permits, because I see it as a great way to utilize a language that I love (Ruby) in a corporate environment where Java is firmly entrenched.

Max is a developer who found his true calling merging ruby and graph databases. He built the Neography Ruby Gem, a rest api wrapper to the Neo4j Graph Database as well as MadCoder.Tv a Roku channel for developers.

Christian Doten is co-proprietor of Four Gates Physical and Energetic Culture in South Minneapolis. He is an ACE certified personal trainer, Kettlebell Concepts certified trainer, has an advanced personal training certificate and associates degree in massage therapy and postural/structural assessment from the Swedish Institute of Health Sciences. He is also a certified yoga instructor and a professional skateboarding enthusiast.

By day, Ian Dees slings code, tests, and puns at a Portland-area test equipment manufacturer. By night, he dons a cape and keeps watch as Sidekick Man, protecting the city from closet monsters. Ian is the author of "Scripted GUI Testing With Ruby" and co-author of the upcoming "Using JRuby."