Derek Zaba cochairs Sidley Austin’s shareholder activism and corporate defense practice. Zaba spends 100 percent of his time on shareholder activism, contested and complex mergers and acquisitions, and corporate governance matters. He has also been involved in hundreds of activist campaigns and contested M&A situations. Zaba was previously the head of the corporate defense practice at a leading shareholder engagement advisory firm and served as a partner and investment professional at activist- and event-driven hedge funds.