“Robert R. Hammond, an artist and entrepreneur who had no experience in the world of public parks, has been paid about $1.2 million over the last 10 years of the High Line’s development — a vast majority of it since 2005. And his salary of $250,000 a year as president and executive director of the nonprofit he helped found, Friends of the High Line, makes him one of the most generously compensated leaders of the 10 major park conservancies in the city.”