Immunology Professor
In my final year of uni I took an elective course in Clinical Immunology at the Middlesex Hospital. The Professor was a very smart, thoroughly engaging chap called Prof Jonathan Brostoff who as well as knowing the subject inside and out (he had written a number of key textbooks on the subject) had a way of bringing it to life that stuck with me. It ended up being the best course I took for my degree.

Fast forward 20 years and I realised throughout my career just how often the stuff he had taught kept coming up - I have been working in immune-related fields a considerable amount.

So I did a quick google search and tracked down where he was now teaching and sent him a "You probably won't remember me, but Thanks" email.

To my delight he replied back saying he was tickled pink to get my note.

I realise reading through this QOTW just how many great teachers I had when I was a kid. I could answer this Question several times. But I'll just stick with the one I bothered thanking and wish I had done that sooner and more often.
(Thomas_The_Spankengine, Sun 20 Mar 2011, 1:45, Reply)