In the years following the publication of "The Fountainhead", Rand received numerous letters from readers, some of whom the book profoundly influenced. In 1951, Rand moved from Los Angeles to New York City, where she gathered a group of these admirers around her. This group (jokingly designated "The Collective") included future Chair of the Federal Reserve Alan Greenspan, a young psychology student named Nathan Blumenthal (later Nathaniel Branden) and his wife Barbara, and Barbara's cousin Leonard Peikoff. Initially the group was an informal gathering of friends who met with Rand on weekends at her apartment to discuss philosophy. She later began allowing them to read the drafts of her new novel, "Atlas Shrugged", as the manuscript pages were written. In 1954, Rand's close relationship with the younger Nathaniel Branden turned into a romantic affair, with the "grudging consent" of their spouses.