Balance has always been important to MIT President Emerita Susan Hockfield. Whether navigating the administrative challenges of a world-class research university or championing new models of interdisciplinary research — and often both at the same time — Hockfield has a keen appreciation for bringing disparate elements together for the greater good. Her book, “The Age of Living Machines,” published in April 2019 by W.W. Norton & Company, celebrates the people and science stories behind the “convergence revolution,” which integrated the life sciences with engineering and the physical sciences to reshape…