这个体系是这样的，
assistant prof->associate prof->prof
Benjamin Pierce Assistant Professor指的是靠以Benjamin Pierce命名的基金或者奖金的职位，跟普通assistant prof除了薪水来源不同，其他都一样。
assistant prof的薪水足够一家3口了，4口也行不过小孩上私立学校就有点吃紧。大学教授的薪水算中上，家庭平均收入是53k，所以一家一个人工作就超过家庭平均水平，生活上面一点压力都没有。
The Benjamin Peirce Fellowship position carries the rank of Assistant Professor. The appointments are for three years with a starting salary of approximately 60'600 for the 9 Month academic year. This salary usually can be augmented by teaching at the Summer School or by working on a research contract if funds are available. The teaching commitment is three half courses per year, including a one-term course on a subject of the lecturer's choice, if desired. The Benjamin Peirce Fellows are expected to take part in the usual tasks of advising students.
Application deadline is December 6, 2010. Apply through Math Jobs.
In order to comply with federally mandated equal opportunity hiring practices, we are required to obtain demographic information from all applicants to faculty positions. We are therefore writing to you to ask that you help us with this process by providing information through the folowing self-identification web site. Please take a moment to click on the link and complete the brief survey.
Submission of demographic information through this form is completely voluntary and the information you provide will be kept strictly confidential. All racial/ethnic information will be gathered and maintained in the Office for Academic Affairs, a location separate from the department and all applicant records. Information on applicant pools will be available to departments only in aggregate form. Your decision to participate (or not) will in no way affect the evaluation of your application now or in the future.来自：求助得到的回答
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