Here are five things you need to know about Kevin Warsh, who reportedly met with President Donald Trump to discuss becoming the next chairman of the Federal Reserve.

Fed Chairwoman Janet Yellen’s term as chief of the central bank expires in February.

He’s an insider who talks like an outsider.

Warsh was a Fed governor from 2006-11 who has been very critical of the central bank in recent years, often in op-eds in The Wall Street Journal. Despite this, many in the larger Fed community see Warsh as an acceptable alternative to Yellen. Stephen Cecchetti, a professor of international economics at Brandeis University, and a former top Fed staffer, said in an interview that Warsh would represent “continuity” at the central bank. Warsh “knows why the Fed did what they did” during the financial crisis, added Diane Swonk, chief economist at DS Economics.

He is not an economist.

Warsh was a lawyer by training who became an investment banker at Morgan Stanley and came to Washington with President George W. Bush. Since leaving the Fed, Warsh has been advising companies from his perch at Stanford University’s Hoover Institute.

His family connections might make him an attractive candidate for Trump.

Warsh is married to Jane Lauder, the granddaughter and heiress of Estée Lauder EL, +0.96% . Her father is Ronald Lauder, said to be a friend and an occasional adviser to the president. Warsh is 47. He was only 35 when he became a Fed governor, the youngest in history. Warsh was a member of one of Trump’s forums for business leaders that was dissolved in August.

Warsh has been critical of the central bank, especially its forecasts.

At the Fed, Warsh became a close ally of former Fed chairman Ben Bernanke. He was often described as being Bernanke’s liaison to Wall Street. He never dissented from Bernanke’s policies, but he did warn against the second round of bond buying in November 2010 shortly after it was launched. Since then, he has said the bond buying has hurt business investment. Last year in a speech to business economists, Warsh said the Fed relied too much on academic “jiggery-pokery” in making its economic forecasts.

Biggest unknown: Would he be aggressive in the next downturn?

Tim Duy, a Fed expert at the University of Oregon, said his biggest question is how Warsh would react in a downturn. The Fed resorted to massive bond buying in 2008 to prop up the economy. “They were able to move quickly and they didn’t have an ideological bias,” Duy said. Republicans have generally believed the Fed has too much discretion, he added. And would that slow down Warsh’s response? Warsh has his fair share of critics from the left. Sam Bell, a Fed watcher, called Warsh’s service a “disaster” in a recent blog post and said Warsh looked out for big banks but not Main Street. “I think it is fair to say that Warsh is less dovish than Yellen, but...aren’t we all?” asked Stephen Stanley, chief economist at Amherst Pierpont Securities.