As expected, Mayor Vincent C. Gray announced that Christopher Murphy, a deputy chief of staff at the Department of Housing and Urban Development, would be his new chief of staff. Veteran campaign consultant Andrea “Andi” Pringle was named his deputy.

Gray introduced the team at a Tuesday news conference where he again talked about missteps in hiring and vetting that his administration has made since he took office in January. “There’s no question these mistakes eroded the public’s faith in their government and their trust in my leadership,” Gray said. “I campaigned on a promise of restoring accountability to city government. The fact of the matter is we haven’t always lived up to that commitment.”

Murphy, who lives in Chevy Chase, said he voted for Gray in last year’s election and has known him for more than a decade. They met when Murphy was executive director of City Year, a nonprofit he founded, and Gray was director of Covenant House, a nonprofit that provides shelter for homeless young people.

Murphy said the “unfortunate, misguided actions of a few” have clouded Gray’s tenure so far. He said he will immediately review the operations and personnel of the mayor’s office. Murphy called himself ”deeply invested” in the District, noting that he has two children in D.C. Public Schools.

Son Aidan Kohn Murphy, a 7-year-old at Lafayette Elementary School, made headlines this summer by conducting a survey and interviewing his pediatrician to argue against the prohibition of chocolate milk in school cafeterias.

Pringle, who has worked on campaigns for Howard Dean and Bill Richardson, said she will move from Montgomery County back to the District.