Born in New York City, Clark received her B.A. from Mount Holyoke College. during her college career, she began re-typing her mother's transcripts. She also made contribution such as renaming locations and characters. Out of her four other siblings, Carol was the only one to go into writing. One thing that made a great impact on this decision was helping her mother. While Mary Higgins Clark attempted juggling a full time job and also trying to finish her second book, the younger Higgins grasped this opportunity to familiarize herself with the process of writing a book and telling tales; not knowing this would be her start in becoming a well-known author. Just as her mother does, Carol Higgins Clark also writes suspense books. One main difference in the writings of the two Higgins Clarks is that Carol's books contain a slight sense of humor that he mother's, Mary Higgins Clark do not posses. All of Carol's novels feature Regan Reilly(the famous recurring character), plot points about male escorts, and pantyhose conventions that come from real sources. In her video for NJN Public Television, Carol explains how she uses her first job experience to help her with ideas about her book. In her book "Iced", she uses a woman who is working at a dry cleaners. The woman uncovers evidence found in the pockets of a customer.Supino, Adrienne. "NJN Notable Highlights-Carol Higgins Clark." Interview. Youtube.com. NJN Publication Television, 5 Aug. 2009. Web. 19 July 2010. .
Carol Higgins Clark chose acting as her profession. Clark began to study acting after graduating from Mount Holyoke. In 1975, she starred in "Who Killed Amy Lang" It aired on Good Morning America. She also performed in Wendy Wassersein's play "Uncommon Women". Based on a novel by her mother, she played lead in the novel based film "A Cry In The Night"
Clark's New York apartment building, The Belaire, was hit by a small plane on October 11, 2006 flown by New York Yankees pitcher Cory Lidle. Her 38th floor condominium was just a floor below the main impact zone. She was not injured in the accident.
Clark has appeared on the game show To Tell The Truth.