John Loughran Colvin is an avid programmer and active member of the D community with multiple projects in flight, including a collaboration aiming to build a comprehensive base for scientific programming in D (http://dlangscience.github.io/).

Jonathan M Davis is the primary author of std.datetime in D's standard library, Phobos, and is one of Phobos' core contributors. He is a professional developer and has experience in a number of programming languages, including C++, Haskell, Java, and D. For better or worse, he's well known in the D community for answering questions and being long-winded. He currently resides in California.

Kingsley Hendrickse is a polyglot software developer who specializes in building software using agile principles. His career began in the late '90s where he focused primarily on functional and automated testing but gradually expanded into agile and software engineering while working at ThoughtWorks.

After many years programming in Ruby and Java, he was introduced to the D language while looking for new challenges. He has a wide range of development interests and is currently focusing on web development using Scala, D, and JavaScript using a functional programming style.

He has spent the last decade working for a wide range of prominent banking and financial companies.

Steven Schveighoffer has a bachelors degree in computer science from WPI, and has 16 years of experience working on various systems from small microcontrollers to enterprise servers. He has been active in the D community since 2007 and has made several major contributions to the D language and runtime.

Steve is a principal software engineer at National Resource Management Inc., an energy savings company (http://www.nrminc.com/).