Notorious Professors

Professors (and any other faculty or staff) can be added using the "employees" property on the "employer" type.  (All educational institutions should be typed as Employer; if one isn't, feel free to add the Employer type.)  If you want to add non-faculty professors (visiting professors, research fellows, and the like), you can add the "academic institution" type, which has properties for these types of roles.

Certainly, but I do not mean "normal" professors but real famous ones such as Nobel Prize Winners, notorious artists who teach, and so on... Every institution has some famous alumni and it would be nice to have a place where one can list the exceptional teachers as well. They are special, or not ??   

I don't think that a separate property for "famous" (for whatever definition of fame someone wants to use) professors is a good idea for the types in the commons domains. We don't separate "famous" alumni, or "famous" employees in other industries separately.  I can see where it would be interesting to find out about them, but have a duplicate property would mean that either the data had to be entered twice or the information about an institution's faculty would be stored differently in two places, making it harder to query that data.  If you (or someone) wanted to create a "Notable Professor" type in a private domain that delegated some of the properties from the education/empolyment models, though, I think that would be a very interesting way to do this.