After three of postdoctoral study at UCSD, he went to Germany in 1978 to work at the Max-Planck-Institute for Aeronomy (now MPI for Solar System Research).
The results showed that a mixed mating system was possibly the main heterogamy of this species, and its endangerment was caused by over-exploitation and habitat loss.
Inside the big cabin that Sara and Alexis planned to share, the two younger sisters added to their workload by building a dividing bulkhead.That gave each girl a semiprivate berth of her own.