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Mark Jongewaard is president and principal of LTI Optics, which develops and sells Photopia — the most widely used optical design software in the architectural lighting industry, used in 44 different countries around the world — as well as provides optical design services for illumination based (non-imaging) optical systems. Jongewaard has extensive experience in lighting software development, lighting and optical analysis, and illumination optical design and training. His broad experience in lighting analysis and algorithm development influenced the calculation modules in all of LTI's products, including Photopia, Lumen-Micro and Lumen Designer.