Robert H. Siemann—encounters and essays (December 1, 2008)
We deeply regret the passing of our friend and colleague, Robert H. Siemann, on September 16, 2008. He was the founding Editor of Physical Review Special Topics - Accelerators and Beams. We are now publishing a dedicated section of essays in memory of Bob Siemann. The essays are from different angles of Bob’s remarkable career and life. We hope these anecdotes and educational remarks are a benefit to our readers.