Dick Costolo was the CEO of Twitter from 2010 to 2015; he also served as the COO before becoming CEO. He took over as CEO from Evan Williams in October 2010. Wikipedia*
On the C-SPAN Networks:
Dick Costolo has four videos in the C-SPAN Video Library; the first appearance was a 2012 Forum. The year with the most videos was 2013 with three videos. Most common tag: Social Media.