* Elizabeth Arden: Arden was one of the first women to start her own cosmetics line, and she is credited with popularizing the use of skincare products and makeup in the United States. She also founded the Elizabeth Arden beauty school, which helped train a generation of cosmetologists.
* Helena Rubinstein: Rubinstein was another successful businesswoman who founded her own cosmetics company. She was known for her innovative marketing techniques, and she was one of the first to use celebrity endorsements to promote her products.
* Max Factor: Factor was a makeup artist who worked with many Hollywood stars, including Marilyn Monroe and Greta Garbo. He is credited with developing many of the techniques and products that are still used in makeup artistry today.
* Charles Revson: Revson was the founder of Revlon, one of the most successful cosmetics companies in the world. He was a marketing genius, and he is credited with popularizing the idea of "color cosmetics" - makeup that was designed to enhance a woman's natural beauty.
* Vidal Sassoon: Sassoon was a hairstylist who revolutionized the way women wore their hair. He is known for his precision cutting techniques, and he helped popularize the bob and the pixie cut.
These are just a few of the many influential figures who helped shape the cosmetology industry in the 20th century. Their contributions have had a lasting impact on the way we think about beauty, and they continue to inspire cosmetologists today.