Bryan is an O.G. systems engineer who worked at Sun and who's given many great talks and worked on lots of cool projects, and Jessie rose to prominence as a core docker developer and prolific and talented blogger/speaker, among other things. Both are well-known engineers with major contributions to open and closed source systems infrastructure. Steve Tuck I don't know yet, unfortunately.

Here are some more links if you're interested: https://blog.jessfraz.com/ https://www.youtube.com/results?search_query=bryan+cantrill

* Edit: Rephrased from "O.G. Sun Engineer", I don't know how accurate "O.G. systems engineer is", it's all relative anyway. For reference, I I'd consider Jess an "O.G. containerization engineer" :)