No response from Professor; how should I remind him about writing a recommendation for me?
I would send an email along these lines (taken from Cindy Au on Quora):


  Dear Professor [Professor's name], 
  
  The deadline for submitting letter of recommendation for [name of
  program/ fellowship] is quickly approaching. I would like to
  inquire if there is still any document I can supply to make your
  writing easier in addition to what we discussed during office hours 2 weeks ago. 
  
  I understand that this is a very hectic time in the school year and
  thus can't thank you enough for your time and support. 
  
  Respectfully yours,
  
  [Your name + ideally a link to some website containing your photo]