It is always good to be able to return to the core. For every programmer is know pages of Agile manifesto

• Kent Beck -
  twitter
  
• Mike Beedle - "I can tell you I came up with that word (Agile)"
• Arie van Bennekum - twitter
• Alistair Cockburn
• Ward Cunningham
• Martin Fowler
• James Grenning
• Jim Highsmith
• Andrew Hunt
• Ron Jeffries
• Jon Kern
• Brian Marick
• Robert C. Martin - twitter
• Steve Mellor
• Ken Schwaber
• Jeff Sutherland
• Dave Thomas