Dr. Kristina Johnson, a former engineer who developed technology critical for the screening of 3D movies and served as under secretary for the Department of Energy in the Obama Administration, will serve as chancellor of New York State’s SUNY college system after the current chancellor, Nancy Zimpher, retires in June. SUNY currently serves some 440,000 students at 29 four-year colleges and 30 community colleges. and is the country’s largest university network. She has said that she plans to focus on promoting excellence in research and teaching, environmental sustainability, and individualized models of education. The latter would help students focus on classes that target their chosen career paths.