made deep and wideranging contributions to mathematics: to topology, analysis, theoretical computer science, and algebra, but first and foremost, to set theory.Ken supervised over thirty doctoral students, several of whom have mathematical descendants of their own.The topologist Mary Ellen Rudin, in her note for the 2011 Topology and its Applications tribute to Ken, observed that "he didn't make waves, but he made both mathematics and mathematicians."Another close colleague, the set-theorist Arnie Miller, wrote that Ken was "not just a brilliant and productive mathematician but what we really admire most about him is his generosity with his mathematical ideas, conjectures, and problems."And he perfectly captured Ken's personality, by describing him as "always affable and always unflappable.