Swapna Liddle fell in love with the city of Delhi after arriving here as a college student. The love led her to do a PhD on the history of the city, and to her involvement in efforts to preserve its rich built heritage. For a number of years she has been closely involved in efforts for conservation and public awareness about heritage, through the Indian National Trust for Art and Cultural Heritage. She leads heritage walks around the city, gives lectures on Delhi's heritage, and answers listeners question's about Delhi's history on a long-running monthly radio show. She is the author of Delhi; 14 Historic Walks (Westland 2011) and Chandni Chowk: The Mughal City of Old Delhi (Speaking Tiger 2017)