Marjorie Stewart Joyner invented a permanent wave machine

Marjorie Stewart Joyner was an American businesswoman. She was born in 1896. An employee of Madame Walker's empire, Majorie Joyner, invented a permanent wave machine. This device, patented in 1928, curled or "permed" women's hair for a relatively lengthy period of time. The wave machine was popular among women white and black allowing for longer-lasting wavy hair styles. Marjorie Joyner went on to become a prominent figure in Walker's industry, though Majorie Joyner never profited directly from her invention, for it was the assigned property of the Walker Company.
Marjorie Joyner was born in the rural Blue Ridge Mountains of Virginia and moved to Chicago to study cosmetology. Madam Walker was a Chicago business women who had come to fame as the beauty product supplier to hollywood star Josephine Baker. Marjorie Stewart Joyner invented her wave machine as a solution to the hair problems of African American women, however, she never profited form her invention. Madame Walker owned the rights.
Marjorie Joyner became the Director of Madame Walker's beauty schools. Together with Mary Bethune Mcleod, Majorie Joyner founded the United Beauty School Owners and Teachers Association in 1945.
Marjorie Joyner also volunteered for several charities that helped house, educate, and find work for African Americans during the Great Depression.