my situtation
My situation is that my advisor and dept chair are very quick: I receieved their signed letters in 3 days after I sent them the drafts! But as you know, their letters do not weigh much. My most important reference is a Sr. Scientist from a National Lab. He immediately said "yes" when I asked him for reference, but now I\'ve been a month after I sent him the draft and I haven\'t had any response from him yet. I also called him, never got a chance to talk and I\'m planning to send him an email again. I know he must be very busy, but just don\'t know if there is a good way to push him...