For the next three years, he was a postdoctoral research associate at Princeton University, and in 1994, he joined the Hayden Planetarium as a staff scientist and the Princeton faculty as a visiting research scientist and lecturer.
He was a postdoctoral research associate at Princeton University. This was for the next three years. He joined the Hayden Planetarium as a staff scientist as a visiting research scientist and lecturer. This was in 1994. This was for the next three years. He joined the Hayden Planetarium as the Princeton faculty as a visiting research scientist and lecturer. This was in 1994. This was for the next three years.