John Davison Rockefeller Jr. (January 29, 1874 – May 11, 1960) was an American financier and philanthropist, and the only son of Standard Oil co-founder John D. Rockefeller. He was often known as "Junior", to distinguish him from his father. He was widely blamed for having orchestrated the Ludlow Massacre. Rockefeller was the father of six children: Abby, John III, Nelson, Laurance, Winthrop, and David.