In 1998, he set up the Urban Task Force at the invitation of the British government, to help identify causes of urban decline and establish a vision of safety, vitality and beauty for Britain's cities. This work resulted in a white paper, "Towards an Urban Renaissance", outlining more than 100 recommendations for future city designers. Rogers also served for several years as chair of the Greater London Authority panel for Architecture and Urbanism. He has been chair of the board of Trustees of The Architecture Foundation. From 2001 to 2008 he was chief advisor on architecture and urbanism to Mayor of London Ken Livingstone; he was subsequently asked to continue his role as an advisor by new mayor Boris Johnson in 2008. He stood down from the post in October 2009. Rogers has also served as an advisor to two mayors of Barcelona on urban strategies.