John Graham-Cumming

CTO, Cloudflare, Inc.
Lisbon, Lisbon,Portugal
Find John Graham-Cumming's Email
Find John Graham-Cumming's Phone

Who Is John Graham-Cumming?

Total Experience32 years
CompanyCloudflare, Inc.
CountryPortugal

John Graham-Cumming is a distinguished computer scientist, programmer, and author, currently serving as the Chief Technology Officer (CTO) at Cloudflare. With a DPhil in Computer Security from the University of Oxford, he has built a career marked by significant technical and social contributions. Beyond his corporate leadership, he is widely recognized for initiating the successful petition that led to a posthumous apology from the British government to Alan Turing. He is also the creator of the open-source email filter POPFile and the author of books like 'The Geek Atlas,' making him a prominent and respected figure in the technology community.

How Did John Graham-Cumming's Career Path Shape Their Journey?

John Graham-Cumming's work history includes a series of influential roles in various companies. Here is a detailed list of his professional journey:

Cloudflare, Inc. - CTO(2011 to Present)
A whole bunch of different startups - Programmer -> VP of Engineering(1992 to 2011)

What Are John Graham-Cumming's Key Achievements?

CTO of Cloudflare

As Chief Technology Officer, he leads the engineering team at Cloudflare, a major web infrastructure and security company, shaping the future of the internet's performance and security.

Alan Turing Apology Campaign

Initiated and led a successful petition that resulted in an official public apology from the British government in 2009 for its historical persecution of Alan Turing, a pivotal figure in computer science.

Author of 'The Geek Atlas'

Authored 'The Geek Atlas: 128 Places Where Science and Technology Come Alive,' a travel guide for tech and science enthusiasts, published by O'Reilly Media.

Creator of POPFile

Developed POPFile, an open-source, cross-platform email classification tool that uses a naive Bayesian filter to sort emails into user-defined categories.

What's John Graham-Cumming's Educational Background?

DPhil, Formal Methods for Secure Systems

University of Oxford - Year 1989

Master of Arts - MA, Mathematics and Computation

University of Oxford

Bachelor of Arts - BA, Mathematics and Computation

University of Oxford - Year 1986

Buying Intent Signals for John Graham-Cumming

Highperformr Signals uncover buying intent and give you clear insights to target the right people at the right time — helping your sales, marketing, and GTM teams close more deals, faster.

Notable news
Hiring actively
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance
Corporate Finance

Company Overview

Cloudflare, Inc.
Total employees3809
HeadquartersSan Francisco
Founded2009

Cloudflare is a global technology company that provides a suite of services aimed at making the internet faster, more secure, and more reliable. For end-users, this means websites load quicker and are protected from online threats like DDoS attacks. The company operates a massive global network that sits between a website's visitor and the website's hosting provider, caching content closer to users and filtering malicious traffic before it ever reaches the server. Its core services include content delivery network (CDN), DNS, and advanced security solutions, helping to build a better Internet for everyone.

Cloudflare, Inc. Stock Information
Cloudflare, Inc., Inc. is listed on the New York Stock Exchange under the ticker symbol NET. The company went public on September 13, 2019

Highperformr's free tools for company research

Find contact info

Get verified emails, phone numbers, and LinkedIn profile details

Find similar contacts

Discover contacts with similar roles, seniority, or companies

Perform deep contact research

Uncover insights like skills, work history, social links, and more

Discover, research and enrich contacts with Highperformr — Smarter, Faster

Explore contacts in-depth — from verified emails and phone numbers to LinkedIn activity, job changes, and more — all in one powerful view.

Highperformr AI helps you surface the right people and enrich your CRM with live, accurate contact insights so your teams can connect faster and close smarter.

  • Track signals like job change, promotion, and LinkedIn activity
  • Enrich contacts with verified email, phone, and social data instantly
  • Automate enrichment and updates with powerful workflows
  • Sync enriched contact info directly into your CRM and tools

Thousands of contacts — including decision-makers, influencers, and ICP matches — are just a search away.

Thousands of companies, including, are just a search away.