David Miller, a former federal prosecutor in the Southern District of New York who spent the past five years at Morgan, Lewis & Bockius, is moving to Greenberg Traurig this week.

Miller, who was once reported to be under consideration for U.S. attorney in Manhattan under the Trump administration, said that he expected he would continue to work on a wide variety of matters for both existing clients and those who come to him through Greenberg.

His bailiwick includes investigations and charged cases involving insider trading, manipulative trading or "spoofing," accounting fraud, the Foreign Corrupt Practices Act, the Bank Secrecy Act and federal sanctions laws. Authorities are "focused like a laser on areas implicating national security," he said.

His recent matters include the defense of the cryptocurrency exchange Bitfinex and affiliate Tether in an investigative action brought by New York Attorney General Letitia James, a case where an appeal is pending. He also represented Kevin Modany, the former CEO of for-profit education company ITT, in a case brought by the SEC that was settled last year.

He has also given technical pointers to the creative team behind the show "Billions," a Showtime drama that centers on a hedge fund and the prosecutors investigating it.

Miller worked at Dewey Ballantine and O'Melveny & Myers before spending nearly a decade in a variety of roles for the federal government, according to his LinkedIn profile. He spent five years in the Southern District, about half of it with the securities and commodities fraud unit, after stints with the Central Intelligence Agency and other units of the Justice Department in Virginia and Washington, D.C. In those roles, he investigated and prosecuted cases involving terrorism and drug trafficking, among other crimes.

More recently, Miller has gone to bat for such clients as banks, broker-dealers, investment advisers, funds and individuals involved with such entities who have faced questions, investigations and prosecutions by civil and criminal authorities such as the Justice Department, the U.S. Securities and Exchange Commission and the Commodities Futures Trading Commission.

About his move to Greenberg, Miller said the firm's work on several major cases had impressed him and he expected to work closely with senior figures at the firm, including Richard Edlin, a firm vice chairman who chairs the New York litigation practice; Nathan Muyskens, who co-chairs the global white-collar criminal defense practice; and Lori Cohen, who co-leads the firm's global litigation practice.

He said he had nothing but good things to say about his former firm,  where he was a partner, but he was attracted to the possibilities he saw at his new firm. "Greenberg has a second-to-none white-collar practice," he said. "It also has a world-class trial practice [and] has a commitment to building an even more robust New York white-collar trial practice."