I have listened to his speech once when he had come to India - and had merely known him as the author of the book about
business models in the rural areas. His recent demise made headlines and along with the news, I came to know a lot of things about him - odd tidbits like the 'C' in his initials stood for my hometown Coimbatore (nice surprise) to extensive obituaries penned by the who's who of the business and academic world.
The more I read about him, the more I was impressed. From the description of him as an academic, he definitely was one I would have loved to have as my professor.
There are some professors who teach you something that you barely remember after coming out of college. And there are those whom you are grateful to for their passing on skills that prove valuable to you later on. And then comes the rare breed of those who make people consider academics as a possible career choice. Like RaviC and CK.