Elizabeth Wood used to work at IBM. She recently resigned from her position as senior content strategist, a job she held for the previous two years. People resign all the time from roles, so that is nothing new. What is different about Ms. Wood’s resignation is a) why we she did it and b) what she did next. On November 15, 2016, Ginni Rometty, chairman, president and CEO of IBM, unleashed an open letter that—among other things—offered President-elect Donald Trump suggestions to help America. In her note, Rometty wrote, “I know that you are committed to help America’s economy grow...