Born 1959. Studied Physics at MIT, Ph.D. at Cambridge Univ., UK (1984). Research Assistant Prof., Tufts Univ. (1987-1989), Assistant Prof. of Physics, Univ. of Wisconsin-Milwaukee (1989-1992), Associate Prof. of Physics, Univ. of Wisconsin-Milwaukee (1992-1997), Prof. of Physics, Univ. of Wisconsin-Milwaukee (1997-2007). Director and scientific member at MPI for Gravitational Physics (Albert Einstein Institute), Hanover (since 2007). Prof. of Physics at Leibniz Univ. Hanover (since 2008).