A top White House official who has been with President Barack Obama since he first became a senator nine years ago is resigning.
Alyssa Mastromonaco is Obama's deputy chief of staff for operations and often described as the most influential person inside the White House who isn't well known outside of it.
She is responsible for planning presidential events, hiring staff and overseeing the White House complex.
A White House official said Mastromonaco is leaving in May to look for a job in the private sector.
Mastromonaco joined Obama's Senate office in February 2005 as scheduling director, and oversaw scheduling and advance for his 2008 presidential campaign and during Obama's first term at the White House. She was promoted to deputy chief of staff in 2011.
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