Charles Severance is a Clinical Assistant Professor in the School of Information at the University of Michigan; he has also taught Computer Science at Michigan State University. Charles also works with the IMS Global Learning Consortium as the IMS Developer Network Coordinator. Previously he was the Executive Director of the Sakai Foundation and the Chief Architect of the Sakai Project (www.sakaiproject.org). Charles is the author of High Performance Computing, Second Edition, published by O'Reilly and Associates. His home page is http://www.dr-chuck.com .