Samuel I SchwartzSamuel I. Schwartz, a.k.a. Gridlock Sam, is one of the leading transportation experts in the United States today. He served as New York City's traffic commissioner and the New York City Department of Transportation's chief engineer. Schwartz crrently runs Sam Schwartz Engineering and is a columnist at the New York Daily News. He has been profiled by the New Yorker, New York Times, and many other national publications. Schwartz lives in New York City. Read More Read Less