I just came across an article, (it’s a bit dated — 2005), which highlights a speech given by Mr. Greenberg at Wharton. Almost immediately, his investment strategy reminded me of Warren Buffett’s of Berkshire Hathaway. In fact, I came across Greenberg’s name as I was reading his introduction to Part V of Security Analysis, by Benjamin Graham and David Dodd (Buffett’s longtime mentors).
Anyway, you can read the article, here.