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Bill Marinelli came to PSI from a postdoctoral position at Cornell University after receiving a Ph.D. in Physical Chemistry from the University of California, Berkeley. At PSI his research activities ranged from upper atmospheric chemistry and chemical kinetics to spectral imaging technologies supporting chemical, biological, radiological, nuclear, and explosives defense. As a senior manager, he had oversight responsibilities for many of PSI’s efforts in materials development, tactical imaging, energy and propulsion technology, and nuclear detection. In his current role as President and Chief Operating officer, he leads PSI corporate business planning activities while having direct oversight of technology transition within its Applications Division.