I am always amazed at the number of very senior IT people who have never heard of him. I read his book as a very junior employee and felt like I was in some kind of secret club compared to everyone above me. People can be forgiven for going down technical dead ends or any of a multitude of bad decisions that are only obvious in hindsight. There is zero excuse for repeating mistakes that are well-documented and avoidable. The funny thing is, it's not like his book is all theory. Anyone who has spent 5 or more years near most big corporate IT shops can readily identify most of the things he mentions in their own organization.