在你举的那个例子里是指系主任。

Endowed professorships

An endowed professorship (or endowed chair) is a position permanently paid for with the revenue from an endowment fund specifically set up for that purpose. Typically, the position is designated to be in a certain department. The donor is allowed to name the position, which typically takes the format: First-name Last-name professorship of Department-name.

http://en.wikipedia.org/wiki/Financial_endowment，

我认为CHAIR更侧重于教授的职位（POSITION），跟国内是不一样的
以我所在组为例，就是一个CHAIR,与系什么都没有关系。
但CHAIR 后面跟DEPARTMENT就可以是这个部门的领导了。
也看哪个国家的体制