The TYPO3 project would not be what it is today without Martin Bless.
Back in the days, the TYPO3 documentation was written with OpenOffice, which made it a nightmare to maintain. A first effort to move to DocBook stalled. Then came reStructuredText and Martin Bless. Martin wrote scripts to migrate (as much as possible) the content from OpenOffice to reStructuredText. He then developed the current documentation rendering chain based on Sphinx, a tool written in Python. He also developed the Docker container that enables everyone to render the documentation locally or via a GitHub action or… you name it!
Moving documentation to reStructuredText made it possible to use version control, which in turn allowed us to receive docs contributions from anyone. Beyond the technical aspects, Martin helped a lot in promoting reStructuredText, encouraging people to contribute to the Core documentation and helping extension authors make the switch.