Milton D. Heifetz (1921-2015) was a leading neurosurgeon and inventor of the Heifetz aneurysm clip, the leading device of its kind during the 1970s and 1980s. Later on in his career, he became active in medical ethics, taking an early pro-euthanasia stance and writing several books on the topic. In this capacity, he was a visiting professor at Harvard University, Massachusetts, a visiting scholar at the University of Oxford and he taught a course in ethics at the Boston College Law School up until his eighties. Wil Tirion is a full-time uranographer. He is famous among the amateur astronomy community for the numerous atlases and star charts he has created. Other successful books include Sky Atlas 2000.0 (with Roger W. Sinott, Cambridge, 1998), The Cambridge Star Atlas, 3rd edition (Cambridge, 2001), The Cambridge Double Star Atlas, 2nd edition (with Bruce MacEvoy, Cambridge, 2015), and The Monthly Sky Guide, 9th edition (with Ian Ridpath, Cambridge, 2013).