Look at the oil business and you'll notice it's mostly men. That's a problem for an industry that needs legions of new workers to replace retirees in coming years.
The industry hasn't always treated women fairly, but now it needs them.
The oil business just 30 years ago was a lonely place for the few women who chose to work in it. Rayola Dougher, senior economic adviser at the American Petroleum Institute, says attending industry conferences made that clear.