About Cal Henderson


Cal Henderson is the Co-founder and CTO of Slack. He has been working as a web applications developer for more than 15 years.

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.

In 2006, Cal wrote the best-selling book Building Scalable Websites, and is currently working on a second edition. In his spare time he continues to publish articles on web application development and contribute to open source projects.

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Useful Links

About iamcal.com

iamcal.com has been online for 15 years, 144 days, 3 hours, 12 minutes and 32 seconds - crumbs!

iamcal.com is primarily cal henderson's personal site, containing his linklog/weblog which he's been posting to regularly since June 2000:

It also hosts a discussion forum where anyone can signup and post. The topic is roughly "whatever". more »

An incomplete list of other sites that Cal has created or been involved with can be found on the network homepage.


Email is the best way to get in touch:
cal [at] iamcal.com

Cell Phone: +1 415-373-8825
If you are trying to sell me something: don't.
I will ignore your phonecalls and emails.

ICQ: 43903925
AIM: iamcal2
Yahoo: iamcal2000
MSN: cal_henderson@hotmail.com
Skype: iamcal
Jabber: iamcal@gmail.com

I moved to San Francisco in 2005, so don't try to contact me in England. My home address is:

Cal Henderson
785 Oak Street
San Francisco, CA, 94117

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