Thomas Uphill is an RHCA who has been using Puppet since 0.24. He has worked as a system administrator for almost 20 years, most recently with RHEL systems. He recently wrote Mastering Puppet, Packt Publishing a book for managing Puppet in large deployments. He has given tutorials on Puppet at LISA and LOPSA-East. When not at the Puppet User Group of Seattle (PUGS), he can be found at http://ramblings.narrabilis.com.