Tell him to learn how to write complex mathematical / analytics algorithms in Octave / MATLAB, than contact me about a job. That way I don't have to learn it.
One of the biggest skills is knowing when you are going to be better off paying somebody else for their skills. I am a marketer and an affiliate manager. If I nee programing, I am really most likely going to go pay a programer. It actually took me years to convince myself that was okay but it saves me so much more time to do my real work.
^Point 5 is key