> I am going to assume that the ~35% number that you are giving without context is the number quoted for peak female representation in earning cs degrees in the 80's. If I am wrong, please correct me. This is much later then I was thinking. I could not find numbers but everything that I have found says that at least a majority of programmers were women in before the early 70's.

Yes, these figures are from degrees earned.

I searched for sources that claim that the majority of computer programmers were women prior to the 70s. The only one I found is very poorly sources. The only one I found was from this page [1] which links to a Guardian article [2], which does not actually provide any data on the workforce composition of computing industries nor how they define what is and isn't a computing job.

> One of the questions I think is important is why were cs degrees so male dominated in something that was previously a female dominated field?

The question cannot be answered because it is based on an incorrect assertion: women never were dominant in programming or computer science - at least computer science as we understand it today.

To be more specific, in order find a time period during which computing was female dominated one has to take a very broad view of what it means to work in "computing". Women dominated computing back when "computer" was a job title [1]. Well into the 20th century, computation was mostly performed by humans and assisted with mechanical calculators [2] and slide rules. This is computing in a very raw sense, but it is not programming. The workers were not creating programs, they were executing programs. This changed during the 1960s and 70s as computers capable of storing and executing programs became cheaper and replaced human computers. To answer your question, women ceased to dominate computing when "computer" no longer referred to people and instead referred to machines and the work involved changed from personally performing computations to programming a computer to perform computations.

Personally, I don't think a human computer has very much to do with computer programming and I think it's a big stretch to try and put the two under the same banner.

1. https://en.wikipedia.org/wiki/Computer_(job_description)

2. https://en.wikipedia.org/wiki/Mechanical_calculator#1900s_to...

> I am going to take your point about a reduction in sexism in other fields at face value since it seems you are more read up on that than I am. I'm not sure if this is a rebuttal to my argument though. A reduction in sexism in other fields would in fact complement an increase in sexism in computer science.

I'm not sure I follow. Why would a reduction in sexism in other fields have any effect on sexism in computer science?

> I'm not sure if it is possible to distinguish the effects of each, especially if they compound on top of each other. It might be a little ironic to choose trial lawyers as an example since I don't think they have that much better of a percentage. I would also like to point out that your conclusion of "field of their choice", in my eyes, is heavily influenced by social factors.

Women exceeded 40% representation in law schools in 1985, and have been at roughly parity since the 1990s. Representation of women in law is unambiguously higher than in computing, and it has been for decades. While the stories of women shared by Clive Thompson specifically wanted to become trial lawyers, their stories were representative of the field of law opening up to women more broadly. The point is, we observe a reduction of women in computing occurring at the time time that fields previously closed to women open up. The result is that women who would have been displaced into computing due to their field of choice being inaccessible now have the opportunity to study their field of choice. This would result in a reduction in women in computing even as computing remained as welcoming as it was before. This is consistent with the data presented by the original post, which observed a negative correlation between gender equality and women's representation in technology fields.