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In 1996, he left IBM to become a consultant and entrepreneur. In 1999, Brown cofounded SmartArrays, Inc., and has held a senior position in the company for many years. The firm develops specialized analytic software based on columnar databases, with memory-resident vector processing, for uses where customers consider commercial off-the-shelf software to be more expensive, slow, or limited. Note: SmartArrays ceased operations and the corporation was dissolved as of February 2019