Remembering Klaus Peters Sigurdur Helgason and Dana Scott, Alice Peters and David Mumford Sigurdur Helgason and Dana Scott Klaus Peters as Mathematical Publisher This piece is a supplement to a biographical note in the December 2014 issue of the Notices dealing with the highly respected publisher of scientific books, Dr. Klaus Peters. Here we intend to describe in more detail his remarkable career as a publisher of mathematical books. After his doctorate in complex analysis in 1962 from the University of Erlangen, Klaus served as assistant professor at Erlangen for two years. Then he was invited by Springer Verlag to be its first in-house mathematics editor. That same year Springer opened its American office in New York. In 1972 Klaus was named one of Springer’s directors, and he hired Alice Merker, who had earned degrees from Rochester and Chicago, to be a mathematics editor at Springer New York. They married that year, settled in Heidelberg, and worked there at Springer Verlag. This account is based on Alice Peters’s recollection of their publishing activity during the last forty years. The 1970s were a boom time for Springer. In addition to several new major volumes, Klaus started at that time at least two new book series with American editors: Applied Mathematical Sci- ences and Undergraduate Texts in Mathematics (edited by Halmos). At the same time Alice started a computer science program at Springer. This included textbooks, monographs, and the various Lecture Notes Series. Klaus felt from the start that in order to build an enlarged mathematics publishing program he would need a full commitment where he would have responsibility for all aspects of the pub- lishing process: acquisition, editing, production, pricing, promotion, etc. He realized that in order Sigurdur Helgason is professor of mathematics at the Mas- sachusetts Institute of Technology. His email address is helgason@mit.edu. Dana Scott is Hillman University Professor of Computer Science, Philosophy, and Mathematical Logic, emeritus, at Carnegie Mellon University. His email address is dana. scott@cs.cmu.edu. DOI: http://dx.doi.org/10.1090/noti1222 to build a world-class program, he would have to internationalize and involve American mathemati- cians. Richard Courant, who had maintained close ties with Springer even through the war, was his initial contact. They immediately forged a great relationship, and Courant introduced Klaus to the whole New York University/New Rochelle group, including Jürgen Moser, Fritz John, Kurt Friedrichs, Peter Lax, Cathleen Morawetz, among others, all of whom became trusted authors and advisors and also close personal friends. He also had close contact with Peter Hilton and Paul Halmos, both already editors of Ergebnisse der Mathematik. The connection with both Peter and Paul went beyond a professional relation, and Klaus considered both among his real friends. Lecture Notes in Mathematics Klaus was strongly involved with the beginning of Lecture Notes. Photo courtesy of Sig Helgason. A signed cover of Lecture Notes in Mathematics from a celebration of its first 500 volumes. This may have come out of a discussion with Beno Eckmann (ETH Zurich) to find a way to dis- tribute preprints or private communications that usually were sent only to a handful of closer col- leagues to a wider audience, in particular, students. Klaus was convinced that this would be considered positively in the mathematics community and 264 Notices of the AMS Volume 62, Number 3