Professor A. J. Kox was Pieter Zeeman Professor of the History of Physics at the University of Amsterdam. He trained as a theoretical physicist and obtained a doctorate from the University of Amsterdam. After ten years of research in theoretical physics, he switched his focus to the history of science with an interest in the history of modern physics in the Netherlands. For forty years, he was one of the editors of the Collected Papers of Albert Einstein. A.J. Kox has also edited the scientific correspondence of Zeeman's fellow Nobel laureate Lorentz. With H.F. Schatz, he has co-authored a biography of Lorentz.
Dr H. F. Schatz holds a doctorate in linguistics from Georgetown University, Washington, DC. She has been active as a writer, interpreter, translator, and editor since the early 1960s. After around ten years of research in sociolinguistics, she changed her focus to international management consulting, particularly on judicial reform and anti-corruption measures in Eastern Europe. She has translated the Dutch letters in A.J. Kox's edition of the scientific correspondence of Hendrik Antoon Lorentz and has co-authored the Lorentz biography.