Dear Professor,

　　This letter of recommendation is for Caleb, a young man I have had the pleasure of knowing for the last 20 months. As a professor emeritus, I have come in contact with thousands of college and graduate students. However, Mr. Caleb stands out as a very extraordinary one with his research and teaching capability, personality and what is more, his "academic spirit".

　　During his graduate study, he worked as my research assistant first, then as a teaching assistant of our department. Usually it is hard for someone to be good at even either one. However, as his adviser, I was pleased to find thatboth works he did was far exceeding what is called good. For example, unlike most other graduate students who are eager to publish essays and thus fear to take pains to make exhaustive investigation for their research, Mr. Caleb made extensive survey for his in the project sponsored by Science and Tech Commission of "Chicago" municipal government.He searched every possible source of information within his reach and affords for related materials. As far as I know, he has been to Beijing to the National Library of China, Science and Tech Information Center, Tsinghua University's Library and most public libraries of "Chicago". He searched both in library and on web, which is a totally new approach to us. Neither was Mr. Caleb satisfied with second-hand information only. During the process, he also interviewed with supervisors of some scientific institutes of "Chicago" to obtain first-hand information.

　　His teaching is equally praiseworthy. I often heard his students said that Mr.Caleb's lectures were interesting and enlightening and they loved to listen to his lectures. In fact, he has his own teaching style.To my knowledge,it is quite western. In other words, he pays more attention to arouse the desire of seeking knowledge among his students instead of maintaining a quiet and rigid lecture atmosphere as most other teachers do.Thus you can imagine his lectures are full of discussions, laughter and eager eyes of learning.