We first worked on the idea of random data generators when we were colleagues at Capita Employee Benefits in London in about 2011. Since then we've continued to work with the idea and have re-implemented it several times after selling the idea to the different teams we've worked with. We've never come across a Java open source library that did what we wanted so decided it was finally time to change that and Fyodor is the result.
If you want to get in touch you can email us, or ping us on Twitter (here and here if that's more your thing. The code is on GitHub where you can raise issues, fork it and submit pull requests if you'd like to contribute, and there's a Google Group for questions, suggestions, complaints etc.
Special thanks for help and ideas: Paul, Simon, Adolfo, Miles, Mike.