written in cooperation with Chloe Zerwick, which supposed the arrival of a message from the stars.

In the March 1987 Bulletin of the Atomic Scientists, Professor John Holdren published an eloquent memorial to Harrison. I will conclude this memoir by quoting part of Holdren's final paragraph. "Harrison Brown was a warm and witty man, cheerful, always a twinkle in his eye, and surprisingly modest . . . . I visited him in the hospital a week before his death, and the twinkle in his eye was still there . His friends will miss that twinkle as well as the extraordinary mind behind it. The world will miss his insights and the energy he devoted to making it a better place."