Originally from Toronto, Glynnis MacNicol is a writer in New York who writes online for publications like the New York Times, the Guardian, Elle.com and The Cut. She is the co-founder of TheLi.st, which bills itself as a "network and visibility platform for professional women from all industries." In 2018, MacNicol published the memoir No One Tells You This. It describes the tumultuous year MacNicol turned 40, as she contends with her mother's declining health and comes to understand that the idea that a woman's happiness is dependent on getting married and having children is just a myth.