There was an interesting interview with him earlier in the year on Software Engineering Radio where he talked about his book:  <a href="http:&#x2F;&#x2F;www.se-radio.net&#x2F;2015&#x2F;04&#x2F;se-radio-episode-225-brendan-gregg-on-systems-performance&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.se-radio.net&#x2F;2015&#x2F;04&#x2F;se-radio-episode-225-brendan...</a>