Dr. Marleau is a Senior Scientist at Sandia National Laboratories with over 20 years of radiation and nuclear-detection experience. He earned a PhD in experimental high-energy particle physics from the University of California Davis in 2006. Throughout his career, he has developed several fast-neutron detection, correlated timing, imaging, and spectroscopic systems for nonproliferation applications ranging from treaty verification to nuclear-emergency response to homeland security and nuclear safeguards. He has led several nuclear-arms-control R&D projects and multinational working groups including the Verification Technologies co-chair for the QUAD initiative, the US-UK Signature Verification Working Group co-chair, and the Science Integration Lead for the PROACTIVE arms control venture. He has remained an active advocate and collaborator for the University Consortia, speaking in courses, helping with laboratory experiment design, supporting workshops, acting as laboratory advisor for over 15 graduate students and as laboratory point-of-contact for NSSC-1, CVT, and now NSSC-4.