The mwclient framework was originally written by Bryan Tong Minh (@btongminh) and released in 2008 on Sourceforge. Bryan maintained the project until version 0.6.5, released on 6 May 2011.
In 2013, Waldir Pimenta (@waldyrious) contacted Bryan and proposed helping out with a conversion from SVN to git and moving the project to Github. After getting the appropriate permissions, he performed the repository conversion using sf2github (#1), converted the wiki previously hosted on sourceforge (#12), updated the sourceforge project page (#15), identified the users who had created bug reports (#1, comment), contacted the authors of forks of the project suggesting them to provide their changes as PRs (#14), and handed the repository to Bryan (#11).
Dan Michael O. Heggø (@danmichaelo) was the author of one of those forks, and the most prolific submitter of PRs in the early history of mwclient as a git repository. Not long after the git transition, the repository was moved to an organization (#12, comment), and Dan became the main force behind the 2014 release of version 0.7.0 (the first after a 3-year hiatus). Since then, he has been the lead maintainer of the project, which has attracted contributions from several other people.
For more details on the technical history of the project, see the CHANGELOG.md document.