Dan Bertolet, research director, housing and urbanism, researches, writes about, and speaks about housing and urbanism. He has a background in urban planning and electrical engineering, and his passion is to help create cities that will thrive amidst the challenges of the 21st century. Find his full bio here. Find his latest research here. Email: dan [at] sightline [dot] org. Twitter: @DanBertolet.