When famous investors share the wisdom they've gained from years of success, those of us on Main Street often sit up and take notice. And when these investors put their money where their mouths are, it's noteworthy -- especially with the Oracle of Omaha himself, Warren Buffett.

Buffett is hardly capricious about his stock purchases. Once a company finds its way into the Hathaway (NYSE: BRK.A) (NYSE: BRK.B) portfolio, it will likely remain there for an extended time. Therefore, it's a worthy exercise for these two fool.com contributors to take a close look at two of Berkshire Hathaway's positions: Apple (NASDAQ: AAPL) and Chevron (NYSE: CVX). 

Lee Samaha (Apple): Representing around 45% of Berkshire Hathaway's publicly-traded equity portfolio, Apple can justifiably be called a conviction Buffett holding. It's also fair to say that this year has been challenging for the company.

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Source Fool.com