Source of portrait of Kate Millett is from here,
which also contains extensive biographical information
I will leave it to one of the feminists I most admire to describe the impact of Kate Millett, who died today. Above, within the caption to the image, is a link to a wiki page on her life and work.
Here is the opening paragraph of an article linked to just below:
The world was sleeping and Kate Millett woke it up. Betty Friedan had written about the problem that had no name. Kate Millett named it, illustrated it, exposed it, analysed it. In 1970 Kate Millett published the book Sexual Politics. The words were new. What was "sexual politics"? The concept was new. Millett meant to "prove that sex is a status category with political implications". She pointed to male dominance in sex, including intercourse. In challenging the status quo, she maintained: "However muted its present appearance may be, sexual domination obtains nevertheless as perhaps the most pervasive ideology of our culture and provides its most fundamental concept of power."
With condolences to her loved ones.