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Cal Henderson

Co-founder & CTO of Slack

Co-founder & CTO of Slack

Travels From Travels From:
San Francisco, CA, USA
Speaking Fee Speaking Fee:
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Cal Henderson Biography

Cal Henderson is the Co-founder and CTO of Slack and oversees the engineering organization at Slack. He is an experienced technology leader, having previously built and led the engineering team at Flickr, through its acquisition by Yahoo.

Slack was previously Tiny Speck, creators of the massively multiplayer online game Glitch. Prior to his work at Tiny Speck, Cal was Flickr's Director of Engineering at Yahoo!. He was an inaugural member of the groundbreaking photo-sharing site, working alongside Flickr co-founder Stewart Butterfield, the now CEO and Co-Founder of Slack.

As a popular speaker on engineering scalability, he authored the best-selling O’Reilly Media book Building Scalable Websites. He was a pioneer in the use of web APIs, and created the basis for OAuth and oEmbed, now used by YouTube, Twitter, and many others.

Cal has a BCS from the University of Central England, and was involved in London’s early online community through his work with the early digital community B3ta and his personal blog iamcal.com, which he has run for over 15 years. Cal now resides in San Francisco.

Cal Henderson Videos

  • Cal Henderson, Co-founder and CTO of Slack | Startup Grind
    Cal Henderson is the co-founder and CTO of Slack. He led the technical development of Flickr from its founding, pioneered the use of APIs, and...
  • EC18 Keynote: Slack, Cal Henderson
    Cal Henderson, CTO & Co-Founder, Slack.
  • Web 2.0 Expo SF 2010: Stewart Butterfield and Cal Henderson, "A ...

Cal Henderson Books

  • Building Scalable Web Sites: Building, Scaling, and Optimizing the Next Generation of Web Applications
    Building Scalable Web Sites: Building, Scaling, and Optimizing the Next Generation of Web Applications

FAQs on booking Cal Henderson

  • How do I book Cal Henderson to speak at my event?

    Our experienced booking agents have successfully helped clients around the world secure speakers like Cal Henderson for speaking engagements, personal appearances, product endorsements, or corporate entertainment since 2002. Click the Check Availability button above and complete the form on this page to check availability for Cal Henderson, or call our office at 1.800.698.2536 to discuss your upcoming event. One of our experienced agents will be happy to help you get speaking fee information and check availability for Cal Henderson or any other speaker of your choice.
  • What are the speaker fees for Cal Henderson

    Speaking fees for Cal Henderson, or any other speakers and celebrities, are determined based on a number of factors and may change without notice. The estimated fees to book Cal Henderson are for live events and for virtual events. For the most current speaking fee to hire Cal Henderson, click the Check Availability button above and complete the form on this page, or call our office at 1.800.698.2536 to speak directly with an experienced booking agent.
  • What topics does Cal Henderson speak about?

    Cal Henderson is a keynote speaker and industry expert whose speaking topics include Business, Communication, Computer Science, Entrepreneurism, Futurism, Innovation, Internet and New Media, Science and Technology, Technology Speakers.
  • Where does Cal Henderson travel from?

    Cal Henderson generally travels from San Francisco, CA, USA, but can be booked for private corporate events, personal appearances, keynote speeches, or other performances. For more details, please contact an AAE Booking agent.
  • Who is Cal Henderson’s agent?

    AAE Speakers Bureau has successfully booked keynote speakers like Cal Henderson for clients worldwide since 2002. As a full-service speaker booking agency, we have access to virtually any speaker or celebrity in the world. Our agents are happy and able to submit an offer to the speaker or celebrity of your choice, letting you benefit from our reputation and long-standing relationships in the industry. Please click the Check Availability button above and complete the form on this page including the details of your event, or call our office at 1.800.698.2536, and one of our agents will assist you to book Cal Henderson for your next private or corporate function.
  • What is a full-service speaker booking agency?

    AAE Speakers Bureau is a full-service speaker booking agency, meaning we can completely manage the speaker’s or celebrity’s engagement with your organization from the time of booking your speaker through the event’s completion. We provide all of the services you need to host Cal Henderson or any other speaker of your choice, including offer negotiation, contractual assistance, accounting and billing, and event speaker travel and logistics services. When you book a speaker with us, we manage the process of hosting a speaker for you as an extension of your team. Our goal is to give our clients peace of mind and a best-in-class service experience when booking a speaker with us.
  • Why is AAE Speakers Bureau different from other booking agencies?

    If you’re looking for the best, unbiased speaker recommendations, paired with a top-notch customer service experience, you’re in the right place. At AAE Speakers Bureau, we exclusively represent the interests of our clients - professional organizations, companies, universities, and associations. We intentionally do not represent the speakers we feature or book. That is so we can present our clients with the broadest and best performing set of speaker options in the market today, and we can make these recommendations without any obligation to promote a specific speaker over another. This is why when our agents suggest a speaker for your event, you can be assured that they are of the highest quality with a history of proven success with our other clients.

Cal Henderson is a keynote speaker and industry expert who speaks on a wide range of topics . The estimated speaking fee range to book Cal Henderson for your event is available upon request. Cal Henderson generally travels from San Francisco, CA, USA and can be booked for (private) corporate events, personal appearances, keynote speeches, or other performances. Similar motivational celebrity speakers are Greg Brockman, Tom Preston-Werner, Jason J. Sosa and Jon Steinberg. Contact All American Speakers for ratings, reviews, videos and information on scheduling Cal Henderson for an upcoming live or virtual event.

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