Perhaps Marshall’s most striking habit was his insistence on leaving the office each day at 5:30 p.m. In an age before cell phones and email, Marshal… - Cal Newport

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Perhaps Marshall’s most striking habit was his insistence on leaving the office each day at 5:30 p.m. In an age before cell phones and email, Marshall didn’t put in a second shift late into the night once he got home. Having experienced burnout earlier in his career, he felt it was important to relax in the evening. “A man who worked himself to tatters on minor details had no ability to handle the more vital issues of war,” he once said.