Lucy Sykes Rellie is a British-American entrepreneur, fashion executive, consultant and socialite based in New York City.

After working in the fashion industry for over sixteen years, Sykes Rellie co-authored her first novel entitled The Knockoff in 2015.

[4] An 18th century forebear, the second baronet, Sir Christopher Sykes (1749–1801), was a major figure in the enclosure movement that seized ownership of common land for private use.

"[7] After working as a stylist and then as editor at Marie Claire, Sykes Rellie became the fashion director of the magazine in 2001.

In 2007, after she had her second child, she left Marie Claire to spend more time with her children, and began working as a consultant for various fashion industry companies.

She also spent time as a contributing fashion editor at Cookie, and as a stylist on staff at Allure and Town & Country.

[12] The protagonist of the novel, Imogen Tate, has been compared to Sykes Rellie, who came back to work after a long hiatus and found it hard to cope with the technological developments.