The Idea: After losing a proxy fight to the activist investor Carl Icahn, Blockbuster’s then CEO faced a new obstacle: executing strategy in the face of boardroom opposition. He looks back on what he might have done differently.

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When my assistant came into my office in early 2005 and told me that Carl Icahn was on the phone, it was a complete surprise. I knew, of course, that Icahn was an “activist shareholder,” but I had no idea why he might be calling. Icahn told me he’d bought nearly 10 million shares of Blockbuster, where I’d served as CEO for eight years. I didn’t know what kind of play he saw in Blockbuster—and I certainly didn’t expect the new challenges his being our biggest shareholder would bring over the next couple of years.

A version of this article appeared in the April 2011 issue of Harvard Business Review.