Melinda Gates Joins Washington Post Co. as Director The firm elects Bill Gates's wife to its board, adding her to a 10-member board that already includes the world's second-richest person, Warren E. Buffett. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-Leslie Walker&lt;/B&gt;&lt;/FONT&gt;