I have been asked to write a professional letter for one of my past professors, He has done alot for me in terms of writing letters of recommendations and research and stuff, and probably wouldn't be where im at today without him. So i want this letter to be really persuasive and professional, problem is Im not sure what is really meant by a professional letter and not sure what exactly to write so that I dont just state the obvious, "he was a good teacher.." blah blah
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"Deep down you may still be that same great guy I used to know. But it's not who you are underneath, it's what you do that defines you" Rachel Dawes, Batman Begins