PEPSI has been the workhorse in two totally different observing campaigns:

• The PETS project has targeted exoplanet host stars
• Hyades ZDI project has been about observing stars with Rossby numbers in the range 0.1–0.4, while of same age. From this, we hope to learn more about the role of the magnetic field topology for rotational evolution and eventually be able to implement these magnetic topologies, energies, and fluxes  boundary conditions for next-generation global dynamo simulations.