Nat, a financial attorney, writer, artist, musician, and viola maker, was born in the Bronx. He went to City College and Columbia Law School, and served at the SEC. He married Griselda Holzinger and they had two children, John Lobell and Griselda Steiner; a granddaughter, Michelle Prochazka; and a great granddaughter, Skye Lobell.
Nat is the author of the book: Of Things that Used to Be: A Childhood on Fox Street in the Bronx in the Early Twentieth Century.