Mike,
Based on what I could find on the list of lecturers, Terry Bishop is the only one on board during the entire Grand Voyage on the Navigator, and he is on for the last 2 weeks.
(I will also say I am always thrilled to sail with Terry and Julie - they are both great additions to any cruise.)
I assume this is not really the case but I had hoped that if this information has been added to the web site, it have more correct information and also, that it would be easier to access.
Good luck going forward in creating a more helpful and user-friendly site.
Peggy