Reuters

Aubrey K. McClendon is one of the most successful energy entrepreneurs of recent decades. But he hasn’t always proved popular with shareholders of the company he co-founded, Chesapeake Energy Corp., the second-largest natural gas producer in the United States.

McClendon, 52, helped cause Chesapeake shares to plummet amid the financial crisis when he sold hundreds of millions of dollars in stock to raise cash for himself. Later, to settle a lawsuit by shareholders, he agreed to buy back a $12 million map collection that he’d sold to Chesapeake.

His approach to running his company also is renowned: Among other employee perks, on-site Botox treatments are available at its headquarters in Oklahoma City, Oklahoma.

Now, a series of previously undisclosed loans to McClendon could once again put Chesapeake’s CEO and shareholders at odds.

McClendon has borrowed as much as $1.1 billion in the last three years by pledging his stake in the company’s oil and natural gas wells as collateral, documents reviewed by Reuters show.