Very little is known about Inez Beverly Prosser, a Texas native who taught in segregated schools in the early 1900s. Her state's universities were segregated, so she travelled to the University of Cincinnati to obtain her doctorate in 1933, making her the first Black woman with a PhD in psychology.
Sadly, Dr. Prosser was killed in a car accident a year after earning her PhD, but her dissertation was widely discussed for years afterward. She found that Black students in segregated schools had better mental health and social skills than those in integrated schools - in large part because of the prejudicial attitudes of the white teachers in those integrated schools. https://feministvoices.com/profiles/inez-beverly-prosser