I was impressed that Stephen Wolfram has been recording his own keystrokes since 2002: <a href="http:&#x2F;&#x2F;blog.stephenwolfram.com&#x2F;2012&#x2F;03&#x2F;the-personal-analytics-of-my-life&#x2F;" rel="nofollow">http:&#x2F;&#x2F;blog.stephenwolfram.com&#x2F;2012&#x2F;03&#x2F;the-personal-analytic...</a>