On snake venom:
Dr Ken Winkel
Director, Australian Venom Research Unit
Department of Pharmacology, University of Melbourne
On forensic pathology:
Dr Shelley Roberts is a forensic pathologist with 25 years experience.
Websites:
Wikipedia is a good start, and then I suggest you progress to Ask Reddit, where everything that anyone has ever thought concerning Somerton Man will be vouchsafed to you. I have tried to contact persiankitty, who tried the code in the Persian language, and whom I believe has a really good idea, but she did not reply. If you can talk to her, do ask her for the rest of her translation.
And all of the documents in the case, including the police notes and both inquests, are to be found at
www.eleceng.adelaide.edu.au/personal/dabbott/wiki/index.php/Primary_source_material_on_the_Taman_Shud_Case
which should tell you all you have ever wanted to know about Somerton Man, except who he was, and why he died. Sigh.