The New York Times first obtained her letter.
Marcus is the latest high-profile Post staffer to exit as Bezos has exercised more control over the news outlet.
In October, Bezos killed a planned editorial page presidential endorsement of Kamala Harris.
Ruth MarcusPhoto by Michael S. Schwartz/Getty Images
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David Shipley, the opinion editor, departed the Post following the announcement.
Bezos attended Trumps swearing in ceremony and Amazon reportedly paid $40 million for a documentary on Melania Trump.
Marcus has been with the Post since 1984.
She joined the editorial board in 2003 and started the column in 1986.
We respect her decision to leave and wish her the best.
