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Thomas A. Limoncelli is the author of O'Reilly's Time Management for System Administration. He is an internationally known author and speaker on many topics, including system administration, networking, security, and grassroots political organizing. A system administrator since 1988, he now speaks at conferences around the world on topics ranging from firewall security to time management. He has worked for Cibernet, Dean For America, Lumeta, Bell Labs/Lucent, AT&T, and Mentor Graphics. He and Christine Hogan co-authored The Practice of System and Network Administration (Addison Wesley). He holds a B.A. in Computer Science from Drew University in Madison, New Jersey, USA. He publishes a blog on EverythingSysadmin.com.