He is internationally recognized for his expertise in the Sakai open source collaborative learning environment. His experience includes work in university teams, commercial teams, and as an independent consultant. An experienced systems architect, Aaron has demonstrated his programming expertise in all aspects of web application development; he is a major contributor to projects such as the Sakai CLE/OAE, DSpace repository, and Opencast Matterhorn. He is also experienced and interested in technical documentation, development of tools for programmers, and developer training. He is a member of open source developer communities like Sakai, Moodle, Opencast, and DSpace. Aaron is an active member of the Sakai CLE Team and Sakai 2 Technical Coordination Committee (TCC).