Important: All participants intending to participate in the sessions at ORNL will need to get security clearance well in advance. Therefore, it is very important to fill out the registration form and submit it by the required deadline. Additionally, to gain entry into ORNL, US citizens are required to have a valid photo ID such as a driver license. Non-US citizens will require a valid passport as identification. Please bring these two forms of identification with you when you arrive for the sessions at ORNL.