Trials Software is currently a 2 man mod development group ran by Trialtrex21 and Cohort(steam usernames). It is completely open to other modders who want a new project to work on! If you want to apply to be a part of the development team, apply!
There are no registered leaders of this group. This can be granted to the right person on request. Also why don't you join the community, we welcome creators and consumers alike and look forward to your comments.