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).

在加大担任三年博士后研究员，便到德国的马普高空大气研究所(今改名为马普太阳系研究所)担任研究员(1978-1998)。