Jeff Speck
“Four Ways to Make a City More Walkable” (TED Talk)
https://www.ted.com/talks/jeff_speck_4_ways_to_make_a_city_more_walkable
In the first few minutes he outlines the urban planning trends of the 1950-1970s which emphasized single use. This led to concentrated areas of living (suburban housing developments), shopping (malls and later box stores), education (large school complexes), and recreation (putting all sports fields in one place). He then argues that if you want to save your town you need to make it walkable by giving people a reason to walk (places to go), with safe, comfortable and interesting walking routes. He points to Newburyport, MA as a model of this kind of city as opposed to the suburban sprawl model.
In a second talk, “The Walkable City,” (https://www.ted.com/talks/jeff_speck_the_walkable_city) he presents data that shows if you want to attract college educated millennials, you need to build walkable and mixed use cities.