Joseph Goldman is an experienced freelance programmer who cut his teeth on 8086 Assembler before joining the Homo Sapiens race by learning to walk upright and adopting more conversational and universal programming languages such as C, Objective C, Smalltalk, Pascal, and more. Over his illustrious 30 year career, he has programmed for VAX under VMS, Sun Microsystems work stations, MS DOS 8088 - Pentium CPUs, MS Windows, Mac OSX, and Linux. A tireless early adopter of new programming paradigms and languages, he is very fond of the new generation of functional and object-oriented programming languages, such as Google's Dart, Opa, Scala, and more, as well as other innovative language designs, most notably REBOL. Today, he specializes in writing web apps and mobile apps for iOS and Android platforms, both smart phones as well as tablets. He is self-employed and can be reached at <TheAppsDude@gmail.com>. In the late 1990s, Mr. Goldman co-authored REBOL - The Official Guide that was published in the year 2000 by Osborne McGraw-Hill.

Alok Menghrajani Computer Science at EPFL and CMU. He graduated in 2005. He then started working in the field of web security and is currently an engineer at Facebook.

Alok got the opportunity to learn Opa when it was open sourced. He realized the potential this framework offered to improve web development; Opa helps build web applications faster and in a safer way.

He has made various contributions to Opa: reporting bugs, providing feedback to the core team, and helping out with community events such as hackathons.

He is also the author of http://pixlpaste.com/, a web application to share screenshots and images written in Opa.

He has also worked on Opa: Up and Running and JavaScript for PHP Developers.