John Levine

Famous expert

Ithaca, New York

Areas of Expertise:

  • compilers
  • e-mail
  • email
  • spam
  • security
  • consulting
  • speaking
  • writing
John Levine, founder of Taughannock Networks, writes, speaks, and consults on e-mail, the Internet, and other computer topics. He has written over 20 technical books, and is the co-author of O'Reilly's lex & yacc, 2nd Edition and qmail. He's also deeply involved in Internet e-mail in general and spam issues in particular as co-chair of the Internet Research Task Force's Anti-Spam Research Group ( ) and a board member of the Coalition Against Unsolicited Commercial E-mail (

He lives and works in the tiny village of Trumansburg NY ( where he reports that being the municipal sewer commissioner was a much cleaner job than dealing with spammers.

flex & bison flex & bison
by John Levine
August 2009
Print: $29.99
Ebook: $23.99

qmail qmail
by John Levine
March 2004
Print: $34.95
Ebook: $27.99

lex & yacc lex & yacc
by John Levine, Tony Mason, Doug Brown
Second Edition October 1992
Ebook: $23.99

John blogs at:

Kyoto’s Nasty 22% City-Bike Hill Climb

May 24 2015

距離125mで高度上昇26m、22%の坂を頑張りました。 I went out for a long bike in the mountains of northern Kyoto on Saturday, and after 120km (75mi) of tough ups and pleasant downs with friends (that I'll write about separately), I made an attempt at a hill so steep that its name on Strava is "Nasty". It's… read more

Why are Eight Bits Enough for Deep Neural Networks?

May 23 2015

Picture by Retronator Deep learning is a very weird technology. It evolved over decades on a very different track than the mainstream of AI, kept alive by the efforts of a handful of believers. When I started using it a few years ago, it reminded me of the first time… read more


May 23 2015

read more

How Shazam predicts pop hits

May 22 2015

Subscribe to the O’Reilly Radar Podcast to track the technologies and people that will shape our world in the years to come. In this week’s Radar Podcast, I chat with Cait O’Riordan, VP of product, music and platforms at Shazam. … read more