As with all Open source projects, no one person can really lay claim to the entire package. The ProFTPD project was started by Floody who took it to approximately 1.2.0pre2/3 before he found that his available time was insufficient to handle this project as well as his other commitments. From approximately mid-1999 MacGyver took over the project and pushed it forward getting 1.2.0 out into the wild. From early 2002 TJ took the reins of the project and started to get releases and new features into the code.
There are also numerous people involved in developing modules and documentation for the project. A number of these have been merged into the core distribution and more are likely to follow.