It's funny how people always cite Einstein on this letter but not Hannah Arendt. Given the subject matter I'd think of her as a way more relevant expert. Probably more about overall pop culture fame than sexism but interesting nonetheless.
To me at least she is known for Eichmann in Jerusalem: A report on the banality of evil. I am not very knowledgeable about her work and do not agree fully on all I know, but she has some interesting analyses.
Sorry missed these comments before but I'd HIGHLY recommend reading The Human Condition, great work that goes into the different types of human activity (labor, work, and action)