It is hosted by Jeff Douglas with professional genealogist Paul J. McGrath until his death on 23 October 2008 while filming in Edinburgh, Scotland.
Professor Noel Zachary (Jeff Douglas) - Professor Zachary, or "Z", is the presiding teacher of the Science Club.
Douglas MacArthur | Douglas | Douglas DC-3 | Douglas Adams | Michael Douglas | Jeff Beck | Douglas Fairbanks | Douglas Bader | McDonnell Douglas | Kirk Douglas | William O. Douglas | Jeff Koons | Jeff Foxworthy | Jeff Buckley | Alec Douglas-Home | Jerry Jeff Walker | Jeff Daniels | Jeff Bezos | Douglas C-47 Skytrain | Lord Alfred Douglas | Jeff Minter | Douglas Mawson | Douglas Aircraft Company | Jeff Tweedy | Douglas Niles | Douglas, Isle of Man | Jeff Sagarin | Jeff Bingaman | Douglas Haig, 1st Earl Haig | Douglas Fairbanks, Jr. |