ame Louise Casey has "stepped back" from her role as the government's chief advisor on homelessness.
She was appointed in February to carry out a review, but the coronavirus outbreak saw her redirected to lead the government's homelessness task force.
Housing Secretary Robert Jenrick thanked Dame Louise for her work, especially around Covid-19.
But homeless charity Crisis urged the government "not to leave a leadership vacuum" after her departure.
The charity's chief executive, Jon Sparkes, said Dame Louise had made "extraordinary progress" in her role, adding: "With the economic impact of the pandemic pushing more people into homelessness, we must redouble our efforts, otherwise we risk rates of rough sleeping rising with all the human misery this entails."