Sam Schwartz is the man who coined the term "gridlock". A former NYC traffic commissioner, he now runs is own engineering firm. Sam developed and is promoting a congestion pricing plan for New York City called "Move NY". We spoke in January 2016 about some of the history of efforts to implement congestion pricing in New York, and about the Move NY plan and its chances of success.
My Guardian article with more about Gridlock Sam's battle against the car in NYC is here: https://www.theguardian.com/cities/2016/jun/01/new-york-city-ban-cars-gridlock-sam-schwartz-manhattan