JAX has been actively developed for over two years now, and as a project, it continues to attract talent to the project. The originators were Dougal Maclaurin, Matt Johnson, Alex Wiltschko and David Duvenaud while they were at all at Harvard, and has since grown to include many prominent Pythonistas including Jake Vanderplas and Stephan Hoyer on the team. (There are many more, whose names I don't know very well, so my apologies in advance if I have left your name out. For a full list of code contributors, the repository contributors page is the most definitive.)