Karen K. Lee, MD, MHSc, FRCPC, is Senior Advisor to the Built Environment & Healthy Housing Program at the NYC Department of Health and Mental Hygiene. Dr. Lee has been the lead for the NYC Health Dept. in its work with 12 city agencies including the NYC Departments of Design & Construction, City Planning, Transportation, and Housing Preservation and Development, and non-government partners, in the development of the award-winning Active Design Guidelines, published in January 2010. Since the publication of the Guidelines, Dr. Lee’s team has developed trainings on Active Design, and has worked with city agencies and private sector partners on developing and implementing Active Design policies and practices in NYC and 15 other U.S. cities.