“When someone calls me from the outside with an investment idea, I’m not going to ask what their sex is.” As Berkshire Hathaway’s annual meeting gets underway in Omaha, Nebraska, Warren Buffett made a surprise appearance today at another conference. Buffett helped kick off the inaugural Variant Perspectives conference, an event for and about women in investing put on by his friend Laura Rittenhouse, the founder of Rittenhouse Rankings, and two other female investors and entrepreneurs: Barbara Ann Bernard, the founder of hedge fund Wincrest Capital, and Kim Shannon, the founder and CEO of Sionna Investment Management.Read Full Story.