The 4th International Conference on Ambient Systems, Networks and Technologies (ANT-2013) is a leading international conference for researchers and industry practitioners to share their new ideas, original research results and practical development experiences from all Ambient Systems, Networks and Technologies related areas. The ANT-2013 will be held at Halifax, Nova Scotia, Canada in June 25-28, 2013. The ANT-2013 will be held in conjunction with the International Conference on Sustainable Energy Information Technology (SEIT). Ambient systems can be viewed as interconnected systems that exist anywhere and everywhere in the environment. These systems are able to work together in the network collaboratively or competitively to provide human users with their daily technological needs, during which these systems remain invisible. This concept has emerged as a major research area with many potential applications. This is because of the multi-disciplinary nature of the themes required such as ubiquitous and pervasive computing, artificial intelligence, networks and communications.