Mark has been writing and testing code for over 20 years. From humble beginnings as a Computer Science/Philosophy double major at UC San Diego, to working at both startups (IPivot) and large corporations (Qualcomm, Intel, Redback Networks, Juniper Networks, and currently Yahoo!) he has always been dedicated to code quality. Currently as a Senior Principal Front End Engineer on the Yahoo Mail team, he helps spearhead the unit testing initiative for the latest rewrite of Yahoo Mail. He has spoken at several internal and external conferences (Yahoo TechPulse 2010 and upcoming in 2011, Yahoo''s Front End Summit, and most recently at YUIConf 2011) about Testable Javascript and is the author of the Open Source Javascript Unit Test Environment https://github.com/zzo/JUTE).