He is presently short- term consultant for UNDP/UN Habitat, India to mainstream SDGs into urban sector in India. He is former Director of the School of Planning and Architecture (SPA) New Delhi. The NITI Aayog had nominated him as Chairperson of Working Group of “City Governance and Smart Cities” as part of National Development Agenda@75 (Year 2022). The Government has appointed him as part time Independent Director of Housing and Urban Development Corporation (HUDCO). He was Director of National Institute of Urban Affairs (NIUA) under the Ministry of Urban Development, Government of India during 2008-12. He worked as Dy. Project Leader, Indo-USAID Financial Institutions Reform and Expansion Program (FIRE) during 1995-2008. Prof. Vaidya has wide academic, research and consultancy experience in Urban Development and Architecture.