The Architect Behind the Curtain Wall Street has its legends, its icons, and its titans. However, there are also those who shape its architecture quietly, without fanfare or press conferences. People whose fingerprints can be found in the footnotes of billion-dollar ledgers, and Derek Bryson Park was one of them. By the late 1990s, he had become a name whispered with reverence in boardrooms and trading floors. As a Managing Director at Lehman Brothers and holding senior roles in its subsidiaries—Rafferty Holdings and Cohane Rafferty Capital Markets—he was not just witnessing but engineering a financial history. What separated Derek from his peers wasn’t just the size of his deals—it was the foresight and finesse behind them. He knew where the markets were heading before most had even opened their maps. And when it came to executing some of the most consequential transactions in mortgage finance, he was always one step ahead.