Perhaps if you know that he teaches there you could email him: I looked at the Paris Conservertoire website and there's an email address for the jazz department and someone there may be able to point you in the right direction (I'm assuming that you mean he's a proffessor of jazz at the Paris Conservetoire and there isn't another institution called the Paris Conservetoire of Jazz, although I may be wrong; and also by saying he
is a professor you are implying that he's still alive...). Anyway, if you're interested the website with contact details is
here the whole thing is French but even if you can't understand French too well the email address should be quite simple to find (I'm probably not allowed to actually post the address here due to the forum regulations (even though it's published somewhere else

!)).
Make sure if you do find out how to contact him that you ask him specific questions not just 'tell me something about you' or similar as that may annoy him! I'm sure he won't mind you talking to him though about his work and it'll sound quite impressive if you say in your viva that you contacted the composer

.