What Does Good Leadership Look Like?

On this President's Day, as we think about the past 45 leaders of America, we ask: What makes for an effective leader?

William Aulet, professor of the practice for technological innovation, entrepreneurship and strategic management at the MIT Sloan School of Management and managing director of the Martin Trust Center for MIT Entrepreneurship. He tweets @billaulet.

Robin Chase, co-founder and former CEO of Zipcar and co-founder of Veniam, a network company that moves terabytes of data between vehicles and the cloud. She tweets @rmchase.

Victoria Budson, founder and the executive director of the Women and Public Policy Program at the Harvard Kennedy School of Government, which tweets @wappphks.