Individuals who sit on five or more corporate boards - particularly at the largest U.S. corporations -- may not have the bandwidth to focus enough energy and time on each company's strategic and operational issues. At least that's the view of Kurt Schulzke, associate professor of Accounting & Law at the University of North Georgia and director of Kennesaw State University's Corporate Governance Center. Schultzke spoke with The Deal's Activist Investing Today podcast about overboarded directors, and his finding that some of the best-performing companies in the U.S., such as Starbucks Corp. (SBUX), Apple Inc. (AAPL) and Johnson & Johnson (JNJ), have directors who don't serve on many other boards.