The following is a personality profile of Howard Zinn based on his work.
Howard Zinn is shrewd, skeptical and tranquil.
He is laid-back, he appreciates a relaxed pace in life. He is calm-seeking as well: he prefers activities that are quiet, calm, and safe. But, Howard Zinn is also self-focused: he is more concerned with taking care of himself than taking time for others.
More than most people, his choices are driven by a desire for discovery.
He is also relatively unconcerned with taking pleasure in life: he prefers activities with a purpose greater than just personal enjoyment. Doesn't find tradition to be particularly motivating for him: he cares more about making his own path than following what others have done.