With the full majesty of the New York Public Library, one of my favorite spots on Earth, here are 20 Reasons Why You Should Write Your Family History by Carmen Nigro, Managing Research Librarian, Milstein Division of U.S. History, Local History & Genealogy, Stephen A. Schwarzman Building (February 9, 2015).
When I lived in New York (1987-91), I worked just a few blocks away at 90 Park Avenue, so I was there several times a week and often also on my lunch hours.