Mark Cederholm, GISP, has over 20 years of experience in developing GIS applications using various Esri technologies, from Arc/Info AML to ArcObjects to ArcGIS Runtime and Web SDKs. He lives in Flagstaff, Arizona.

Andy Gup is a developer evangelist with Esri who focuses on building Mobile web and native Android map applications. He works on everything from small websites to enterprise systems, and he is also involved in a number of open source projects. You can check out his blog at http://www.andygup.net or reach him on Twitter at http://www.twitter.com/agup.

Antti Kajanus is a Finnish programmer who is very interested in mobile development and focuses on .NET client technologies. For the last 4 years, he has been creating customer solutions that are based on ArcGIS Server and ArcGIS Online. For the first 3 years, he was working as a software architect at Esri, Finland and after that he joined Esri's ArcGIS Runtime for the .NET development team. Currently, he lives in Edinburgh, Scotland.

He is an active presenter and loves to talk about ArcGIS application development and development practices. He's also a familiar face at Esri's Developer Summit conferences. If he's not building awesome GIS technology or applications, you can most likely find him roaming the Scottish mountains.

Noah Sager is a writer of code and prose and he is based out of a tiny mountain town in southern California. Originally from New Hampshire, he got a BSc in biology from McGill University and an MA in geography from Chicago State University. He recently received a GIS certificate from CSU and the TEFL Certificate from Literacy Works. He's worked in a variety of fields ranging from behavioral ecology to dairy farming, but it's GIS that he's truly passionate about. Currently, he supports GIS developers who are working with web and mobile applications and specialize in JavaScript, Flex, and iOS (Objective-C/Swift).