David Karnok is the project lead and top contributor of RxJava. He is a PhD candidate in the field of production informatics. He is originally a mechanical engineer by trade who has picked up computer science along the way. He is currently a research assistant at the Engineering and Management Intelligence Research Lab under the Hungarian Academy of Sciences. He was also the first to port the historical Rx.NET library to Java back in 2011 (Reactive4Java)--2 years before Netflix started over again. Starting from late 2013, he contributed more than half of RxJava 1 and then designed, architected, and implemented almost all of RxJava 2 known today. In addition, he is perhaps the only person who does any research and development on reactive flows in terms of architecture, algorithms, and performance, of which, the major contribution to the field is the modern internals in RxJava 2 and Pivotal's Reactor Core 3. If one wants to know the in-depths of RxJava, Reactive-Streams, or reactive programming in general, David is the go-to "guru" worth listening to.

David is also a reviewer of the book, Learning Reactive Programming With Java 8, by Packt, and Reactive Programming with RxJava, by O'Reilly.

David Moten is a software developer, largely on JVM, who loves creating libraries for others and himself to use. Contributing to open source projects and participating in open source communities has been a source of enjoyment for him and a considerable education in recent years, with some really interesting complex problems in the RxJava project. RxJava itself has proven to be a huge boon, both in his workplace and outside of it, and David sees reactive programming growing in importance in mobile, backend, and frontend applications.