He created a "dog farm" in the Eifel region in 1977, and was a founder of the German Wolf Protection Society. He has published a number of books and numerous articles on wolf behavior, and has also studied the behavior of wild dogs.
Definitely a must, especially for beginners, no matter whether you think that the mentioned stereotypes are still around or not.
Ps. According to some researcher observing Indian Pariah dogs these dogs there did not act wolfish because they searched for food alone or in pairs. Hm, the interesting thing is that Mr. Bloch observed exactly the same behavior... on Canadian timberwolves.