Resnick was born Lynda Rae Harris in Baltimore, Maryland, but raised in Philadelphia, Pennsylvania. Her Father, Jack H. Harris, worked as a film distributor during the 1950s; he is known for producing The Blob, which later became a cult favorite. Her mother, Muriel (née Goodman), was an interior designer. Because of her father's occupation, Resnick, at the age of four, had a recurring role on The Horn & Hardart Children's Hour broadcast from WCAU-TV in Philadelphia. Resnick graduated from Harriton High School. After a brief stint at a local college, Resnick took a job at the in-house ad agency for Sunset House catalog. Resnick founded an advertising agency, Lynda Limited, at the age of 19.