grading job

Okay, today I meet with Dr Miller. One of the math professor in IUPUI whom I'm working with this semester. He's a really nice guy and we go through the course syllabus and he explains how soon he needs the assignment and he also understand that sometimes I can't return the assignment in 2 days. So end of talk, then we make a deal. He's a really nice professor, btw the class that I'm grading was M-119 which was calculus for business people. Then I have 2 other professor, the first one is Dr Bart Ng and the second one was Dr Zhen. Dr Ng never reply my e-mail and I don't know why, I always try to meet him on his office but he was never there when I'm coming in, it's just like when I take a class with him. He's a very busy person and only spend probably 1 hour in his office and then teaching. Dr Zhen, he's a very unique person, I send him e-mail once. Then he never reply it, until yesterday he send e-mail back to me and he only said that he already put something on my drop box and expect it to be back tomorrow. Okay, this is serious, he never talk with me and expect me to finish his grading assignment in 2 days. What a professor ? Well, I think I just need to do my job Hehe. But to be honest he makes me work hard this semester especially since his class was a differential equation class. It's not an easy class to grade + I have to consider giving partial credit to the students since I've become a student in that class before and I know the feeling of hoping to get a partial credit.