If we are looking for witnesses quickly, there's Equal Voice, a multipartisan organization about women in politics. I think that's one. Nancy Peckford is the executive director.
For international witnesses, certainly, there's Julie Ballington, who did all the work on family-friendly parliaments with the IPU, the Inter-Parliamentary Union. She's now with UN Women and based in New York.
I'll suggest and put forward a number of names, but these are just in case we're looking at some people quickly.