John,
I hope someone didn't die......
Anyway, I am not sure if I am the best or worst to answer this question, but I doubt many others here even know KN well enough to answer, which may be your answer. And my memories of my time there are generally fond, and that I got GREAT gca training.
For others, I think that overall, they rate a mention in the 60's to 2000 era, perhaps about like Stiles merits a mention from the GA. They will be remembered for Kemper Lakes. Kemper Lakes will be remembered as a course Payne Stewart won on, but that was otherwise only selected because of the clout of Kemper and was one of a run of PGA venues that later convinced the PGA to stick with more traditional courses for the most part.
Later, Dick Nugent has Harborside and a few other notable courses, while Ken fell off the map in terms of high profile work. FWIW, they might be remembered for the slew of gca's that came out of their office, including myself, Jim Engh, Bob Lohman, Stan Gentry, Jim Blaukovitch, and the late Bruce Borand, among others. While the work style and intent of their protoges varies, with most of us following their path of more moderate public and less private course design, all are solid course designers and have designed venues enjoyed by millions, even if only the occaisional tournament is played on our courses.
Some here will remember them for disfiguring classic Chicago courses, but in their defense, they started in 1964 and the general trend then was modernization, bunker rationalization, and maintenance friendly design. As bad as the golf biz is now, I believe that in the sixties, and in the first oil scare of 1974, the golf biz was even worse, and their designs reflected a certain prevalent practicality.
They trained under RB Harris and were technically sound. They realized that the moon crater bunkers were an aesthetic nothing and determined to follow the work of Dick Wilson, albeit toned down just a bit for maintenance reasons. They considered RTJ as a model as well) While some of their holes might be considered mundane or strategically lacking, given their client base, they rarely designed a truly bad or awkward hole.
To answer some of John's questions about how they got so much Chicago remodel work, I remember them talking about their early days, and they felt they were at a disadvantage to Larry Packard, who started earlier and had better connections. They focused on wooing superintendents to get the one or two green remodels, in large part because they thought that was what was available to them. Apparently it worked, because they probably only designed 20 new courses together in their 20 year partnership, but must have remodelled in part about 5-10 times that.