My contact details
You can reach me at rabjohnson@gmail.com

I don't currently have a fixed postal address for snail mail, when I get one I'll add it

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All of the lecture notes are from lectures given in my undergraduate lectures while at Cambridge University. They all appear with the kind permission of the relevant lecturer, who is credited on the front page of each course.

You can find their contact details by searching the University of Cambridge's Maths Department website.
The department is split into two halves, roughly for Pure and Applied Mathematics, you might need to look through both to find the relevant lecturer.

If you are unable to reach someone, you can always send me the message and I'll do my best to make sure it gets through.