DUBLIN—U.S. Treasury Secretary Janet Yellen said President Joe Biden should pick an “experienced and credible” person as Federal Reserve chair to reassure markets, and while current chair Jerome Powell fit the bill, others would too. Powell, a Republican placed in the job by former President Donald Trump, is widely favored to win reappointment to another term, and some economists and investors have fretted that financial markets could see turbulence if Biden picks another candidate. Yellen, who has not publicly endorsed a candidate, told Reuters she gave her advice to the president and it was his decision to make. She declined to say if she supported Powell, as some media have reported. Asked whether market concerns should factor into Biden’s decision, Yellen said Biden should pick someone seen as a credible and capable policymaker. “I think Powell has acquired that reputation, but there are other candidates too, who I think would …