Thomas H. Ptacek

This is a short bio I wrote because I rant a lot on Twitter but my Twitter bio doesn’t explain anything about who I am or what standing I have to rant about the things I rant about. This bio may not convince you that my ranting is valid or that I should be ranting at all, but I hope that it makes me just a little bit less confusing.

I’m a security researcher and a software developer.

Right now, I'm a developer at If you're looking for a place to get a Dockerfile running in the cloud, you probably won't find an easier way.

I’m maybe best known as one of the three original founders of Latacora (with Erin and Jeremy), and one of the original three founders of Matasano Security (with Dave and Jeremy), which was prior to its acquisition by NCC Group one of the largest software security firms in the US. I’ve been working in software security since 1995, and was a member of the industry’s first commercial vulnerability research lab, at Secure Networks. A lot of my work there involved intrusion detection systems.

Two other things I had a hand in that people seem familiar with:

I’m a reviewer for several security conferences. If I underwent mitosis at this moment, the two beings that would result would be the two highest-karma users on Hacker News.

Updated in July of 2021, after I finally found the Yubikey that lets me into this dumb static web page.