Chris Seaton is a Research Manager at the Virtual Machine Group in Oracle Labs, where he leads the work to implement Ruby using the next generation of Java Virtual Machine technology and other projects, and a Visitor at the University of Manchester.
Before this he completed a PhD at the University of Manchester under the supervision of Doctor Mikel Luján, where he researched programming languages and irregular parallelism, and he earned an MEng at the University of Bristol on languages with mutable syntax and semantics.
Between his undergraduate degree and starting his PhD he commissioned into the British Army, serving in training and operations in the UK and around the world. In his spare time he's now a captain in the Cheshire Yeomanry squadron of the Queen's Own Yeomanry, Cheshire's historic reserve light cavalry squadron.
He used to develop an award winning medical app that is the first app regulated as a medical device in the UK, and ran a consultancy to help clients such as the NHS to develop revolutionary medical software.

Markus is the author of mutant, a mutation testing tool for Ruby. He is a self defined dynamic language exorcist, specializing in rescuing bloated software of business value. ROM / DataMapper alumnus.

Ruby/Rails freelancer with a strong interest in functional programming and applying its techniques to object oriented code. Former active OSS contributor, author of various small Ruby gems. Merb, DataMapper and ROM core team alumnus.

Chess player. Guru of Rails Refactoring. Writer and Ruby teacher at the University of Wrocław.

Norbert Wójtowicz is a recovering empty-stack developer, whose magic 8-ball predicts that Clojure and ClojureScript will be in your future toolbox. You can find his code and ramblings in various corners of the internet, under the felicitous handle @pithyless.

Passionate Ruby-off-Rails developer, creator of Shrine and test.vim.

I have been a professional programmer since 2006. I've worked both ends of the abstraction hierarchy, from device drivers to web applications. I've run my own company and was lead "vocalist" in a punk rock band in high school.
I've been working exclusively on microservice-based projects for a few years and am writing a book for The Pragmatic Bookshelf entitled "Practical Microservices: Build Event-Driven Architectures with Event Sourcing and CQRS".

I'm Hanami core developer and an indie developer from Moscow. I work on different open source projects and builds Space-Rocket ships at night.

I'm a software engineer at Red Hat working on the ManageIQ open-source cloud and infrastructure management project. I started with Ruby in 2011 when my roommate at the university gave me a "Rails for Dummies" book.

I am the mathematician, backend developer at Amplifr, logux_rails gem maintainer. Family-man with 3 kids, contributing to OSS occasionally.

Wannabe sugarfree señor developer. Mostly does React and MobX these days but you didn't hear that.