André Arko first encountered Ruby as a student in 2004, and reading the first edition of this book helped him decide to pursue a career as a Ruby programmer. He is team lead of Bundler, the Ruby dependency manager, and has created or contributes to dozens of other open source projects. He works at Cloud City Development as a consultant providing team training and expertise on Ruby and Rails as well as developing web applications.
André enjoys sharing hard-won knowledge and experience with other developers, and has spoken at over a dozen Ruby conferences on four continents. He is a regular volunteer at RailsBridge and RailsGirls programming outreach events, and works to increase diversity and inclusiveness in both the Ruby community and technology as a field. He lives in San Francisco, California.