John lectures regularly on ships for Cunard, P&O, Viking Ocean Cruises and Voyages to Antiquity. He also lectured on Voyages of Discovery and Swan Hellenic.
Here is a list of ships that have engaged John:
- Adonia, Arcadia, Aurora, Azura & Oriana (P&O)
- Aegean Odyssey (Voyages to Antiquity)
- Minerva (Swan Hellenic)
- Queen Elizabeth, Queen Mary 2 & Queen Victoria (Cunard)
- Viking Jupiter, Viking Sea, Viking Sky & Viking Star (Viking Ocean Cruises)
- Voyager (Voyages of Discovery)
John Sherlock 