Charles Nessler is usually credited with inventing the permanent wave in the early 1900s. And he made a huge fortune from it, while also bolstering a huge beauty industry.

Research:

Bedi, Joyce. “GERMANY | Charles (Karl) Nessler.” Lemelson Center for the Study of Invention and Innovation. Smithsonian National Museum of American History. June 3, 2021. https://invention.si.edu/node/29205/p/732-germany-charles-karl-nessler
Hellman, Geoffrey T. “Profiles: Hair Scientist.” The New Yorker. April 29, 1933. https://archives.newyorker.com/newyorker/1933-04-29/flipbook/020/
Larkin, Theresa. “From straight to curly, thick to thin: Here's how hormones and chemotherapy can change your hair.” MedicalExpress. Jan. 14, 2024. https://medicalxpress.com/news/2024-01-straight-curly-thick-thin-hormones.html
“115 Years of Long-Lasting Curls: The History and Rebirth of the Perm.” Estetica Magazine. Feb. 8, 2022. https://www.esteticamagazine.com/2022/02/08/111-years-of-long-lasting-curls-the-history-and-rebirth-of-the-perm/
Marsden, Rhodri. “Rhodri Marsden's Interesting Objects: The Nessler Permanent Wave Machine.” The Independent. Oct. 9, 2015. https://www.independent.co.uk/life-style/fashion/features/rhodri-marsden-s-interesting-objects-the-nessler-permanent-wave-machine-a6674081.html
“Modern Living: The Great Wave.” Time. Feb. 5, 1951. https://time.com/archive/6825188/modern-living-the-great-wave/
Morton, Ella. “The Alarming Aesthetics of Jazz Age Perm Machines.” Atlas Obscura. Aug. 2, 2016. https://www.atlasobscura.com/articles/the-alarming-aesthetics-of-jazz-age-perm-machines
Nessler, Charles. “The Story of Hair.” New York. Bonni and Liveright. 1928.
Nessler, Charles. “A New or Improved Method of and Means for the Manufacture of Artificial Eyebrows, Eyelashes and the like.” UK Patent Office. Accessed via Google: https://patents.google.com/patent/GB190218723A/en
“Nessler, Invented Permanent Wave.” New York Times. January 24, 1951. https://timesmachine.nytimes.com/timesmachine/1951/01/24/88426426.pdf?pdf_redirect=true&ip=0
“A Revolutionst Dies.” Life Magazine. Feb. 5, 1951. Accessed online: https://books.google.com/books?id=50sEAAAAMBAJ&q=nestler#v=onepage&q=nessler&f=false
Sheen, Maureen. “Story of Us, 1910-1920: Do the Wave.” American Salon. Jan. 20, 2016. https://www.americansalon.com/products/story-us-1910-1920-do-wave

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Charles Nessler’s Permanent Waves

Stuff You Missed in History Class