Mark Rennella is a writer, editor and teacher who uses a historical perspective to examine and unpack today’s complex business trends. He has authored popular Harvard Business School cases on a variety of topics as well as a book on leadership, Entrepreneurs, Managers and Leaders, co-written with Nitin Nohria and Anthony Mayo (Palgrave Macmillan, 2009). Mark’s many books, articles, business case studies, and collaborative writing endeavors have garnered him critical praise from historians, academicians, and business leaders alike. In 2001, Mark earned a PhD in American History at Brandeis University.