When you look at the real estate industry, at its surface, you can see why the rumblings about it being a boy's club are so pervasive. After all, the leaders of the ten largest brokerage firms in the nation are men. But, I've interviewed a plethora of top female leaders and, at REAL Trends, four of the top six company leaders are women. So, I wondered, what are the numbers? Is real estate leadership a boy's club?