Penny Gentieu is an award-winning photographer whose work is in permanent collection of the Art Institute of Chicago and the Museum of Contemporary Photography. Published worldwide, she has to her credit over 200 magazine covers, including 18 Time and Newsweek covers. She is the author of 13 books of babies. Her stock photo website, was one of the first single-photographer photo licensing websites on the internet, recognized in several publications including PDN (Photo District News), How Magazine, and Shutterbug. Her work has been the subject of American Photographer, Photo Insider, and PDN feature articles.

Her mother, Audrey Gentieu, was an artist, her great great grandfather, Pierre Gentieu, was a photographer, and her daughter, Anna Friemoth, is a photographer. The four generations of artists were the subject of the 4 Generation Gentieu Friemoth Art Exhibition at the Paula Brown Gallery in 2015.

The Museum of Contemporary Photography wrote this about her work:

Gentieu uses this family history to highlight the relationship between memory and experience, particularly in how a visual language can traverse generations. Comparing her black-and-white snapshots with the works of her family, she portrays how genetic ties can carry a visual trace.

Her book, Baby! Talk! has been chosen for the past two years by Dolly Parton's Imagination Library to be given to about 100,000 babies each year.