Christoffer Niska is a web developer from Helsinki, Finland. He maintains many open source projects that are mainly extensions of the Yii PHP framework. Christoffer's most notable open source effort is Yiistrap, which is an extension for Yii that allows developers to use Twitter Bootstrap along with Yii in a very convenient way.

Christoffer is the CTO at Nord Software Ltd., a company based in Helsinki that delivers cutting-edge web solutions to various clients of all sizes. At work, he helps clients to transform their vision into reality. During his hours off from work, he maintains his open source projects, experiments with web technologies, and makes arcade games using HTML5 and JavaScript.

Christoffer's Twitter handle is @Crisu83 and his online portfolio can be found at http://crisu83.me. Extending Bootstrap is his first official attempt at writing and very likely, not the last.