LISA Pathfinder is the precursor mission for all LISA-like missions.
The LISA Pathfinder working group consists of members from those EU member states which form part of the LISA Pathfinder Science Working Team. Together with the members of the LPF Data Analysis team, this working group is focussed on the definition and testing of the experiments planned for the in-orbit operations phase of the mission. This is achieved through mission simulation campaigns, active involvement in flight hardware test campaigns, as well through dedicated meetings, telecons and focussed activities.
For more information on LISA Pathfinder, the technology, the science and the activities, see here.
All interested scientists are welcome to join the working group by applying to the consortium and then for WG membership. Once you are a registered scientist, you can go to your account and use the Apply for Working Group button at the top to access the list of available WGs.