Chet Hendrickson has been involved with Agile Software Development since 1996, when as a member of Chrysler’s C3 project he helped develop Extreme Programming. In 2000, Ron Jeffries, Ann Anderson, and Chet wrote Extreme Programming Installed. It detailed XP’s core practices, how to do them, and how they work together to help teams be successful. Chet is the first signatory to the Agile Manifesto. Since 2002, Chet has been an independent consultant, coach, and trainer. In 2009, he was asked by the Scrum Alliance to help develop the Certified Scrum Developer program. Chet and Ron Jeffries taught the first CSD course and continue to offer them in the United States and Europe. He has been a Certified Scrum Trainer since 2009. Ron and Chet were the curators of the Scrum Alliance’s Agile Atlas website and in that function created the Alliance’s official Scrum description, Core Scrum. Chet and Ron Jeffries often work together and are popular conference speakers, bringing an interesting mix of humor and deep knowledge, and the odd cat picture. The are a fixture at the Agile Alliance’s annual conference, Agile 20xx, as presenters in the Stalwarts track.