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When Brian Bowles speaks about his brother, he is full of admiration, humor and lingering grief. Greg Bowles, a University of Tulsa graduate and pioneering energy executive, died only two and a half months after being diagnosed with cancer. “Greg always admired what the George Kaiser Family Foundation does,” Brian Bowles said. “He would tell me that we needed something like that — making a meaningful impact for people who fall through the cracks.”