Janet L. Yellen has dedicated most of her professional life to the Federal Reserve. She served in its highest-ranking roles, including as president of the Federal Reserve Bank of San Francisco, on its Washington-based board and as the central bank’s first female chair. When President Donald J. Trump decided to replace her in that role in 2017, she was sorely disappointed.Now, as Treasury secretary, Ms. Yellen is getting another chance to shape the future of the institution. She will be a critical voice in deciding who ought to lead the central bank in what some see as a once-in-a-generation …
