Fantastic public speaker, creator of Exercism, and co-author of 99 Bottles of OOP.
Talks given
Overkill - Katrina Owen presents at E4E Developer Conf in 2014. A story about practice on basic problems is a path to mastery in your craft.
Here be Dragons - Catrina Owen presents at RubyBath in 2015. A story about fixing a bug, then going further and fixing underlying structural problems.