(CNN) One of the more well-known members of the special counsel's team is expected to leave the office and Justice Department soon, a spokesman for the office confirmed Thursday.

It's another possible sign that Robert Mueller's work is coming to a close.

Andrew Weissmann, one of the earliest members of Mueller's squad and the lead prosecutor bringing the case against President Donald Trump's former campaign chairman Paul Manafort, will soon leave the Justice Department, where he spent most of his career, to teach at New York University. He previously taught courses on criminal procedure and national security at NYU School of Law.

"Andrew Weissmann will be concluding his detail to the Special Counsel's Office in the near future," Peter Carr, the special counsel's office spokesman, said on Thursday. Carr did not provide Weissmann's exact departure date.

The move was first reported by NPR.

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